Difference between revisions of "Carl Friedrich Gauss"
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Among his many accomplishments were quickly calculating the sum of the integers 1-100 in the first grade and proving that a 17-gon was constructable. He even asked for a 17-gon to be put on his tombstone. | Among his many accomplishments were quickly calculating the sum of the integers 1-100 in the first grade and proving that a 17-gon was constructable. He even asked for a 17-gon to be put on his tombstone. | ||
+ | |||
+ | {{Infobox_Scientist | ||
+ | | name = Johann Carl Friedrich Gauss | ||
+ | | image = Carl Friedrich Gauss.jpg | caption = Carl Friedrich Gauss, painted by [[Christian Albrecht Jensen]] | ||
+ | | image_width = 230px | ||
+ | | birth_date = {{birth date|1777|4|30|df=y}} | ||
+ | | birth_place = [[Braunschweig|Brunswick]], [[Germany]] | ||
+ | | death_date = {{death date and age|1855|2|23|1777|4|30|df=y}} | ||
+ | | death_place = [[Göttingen]], [[Hannover]], [[Germany]] | ||
+ | | residence = [[Germany]] | ||
+ | | nationality = [[Germany|German]] | ||
+ | | field = [[Mathematics|Mathematician]] and [[Physics|physicist]] | ||
+ | | work_institutions = [[Georg-August-Universität Göttingen|Georg-August University]] | ||
+ | | alma_mater = [[University of Helmstedt|Helmstedt University]] | ||
+ | | doctoral_advisor = [[Johann Friedrich Pfaff]] | ||
+ | | doctoral_students =[[Friedrich Bessel]]<br>[[Christoph Gudermann]]<br>[[Christian Ludwig Gerling]]<br>[[Richard Dedekind|J. W. Richard Dedekind]]<br>[[Johann Encke]]<br>[[Johann Listing]]<br>[[Georg Friedrich Bernhard Riemann|Bernhard Riemann]] | ||
+ | | known_for = [[Number theory]]</br> [[Gaussian|The Gaussian]]</br>[[Magnetism]] | ||
+ | | prizes = [[Copley Medal]] (1838) | ||
+ | | religion = | ||
+ | | footnotes = | ||
+ | }} | ||
+ | '''Johann Carl Friedrich Gauss''' ({{pronEng|ˈɡaʊs}}, {{Audio|De-carlfriedrichgauss.ogg|<small>listen</small>}}; in [[German language|German]] usually ''Gauß'', {{lang-la|Carolus Fridericus Gauss}}) ([[30 April]] [[1777]] – [[23 February]] [[1855]]) was a [[Germany|German]] [[mathematician]] and [[scientist]] who contributed significantly to many fields, including [[number theory]], [[statistics]], [[mathematical analysis|analysis]], [[differential geometry]], [[geodesy]], [[electrostatics]], [[astronomy]], and [[optics]]. Sometimes known as "the prince of mathematicians" and "greatest mathematician since antiquity", Gauss had a remarkable influence in many fields of mathematics and science and is ranked as one of history's most influential mathematicians.<ref name="scientificmonthly">Dunnington, G. Waldo. (May, 1927). "[http://www.mathsong.com/cfgauss/Dunnington/1927/ The Sesquicentennial of the Birth of Gauss]". ''Scientific Monthly'' XXIV: 402–414. Retrieved on 29 June 2005. Comprehensive biographical article.</ref> | ||
+ | |||
+ | Gauss was a [[child prodigy]], of whom there are many [[anecdote]]s pertaining to his astounding precocity while a mere toddler, and made his first ground-breaking mathematical discoveries while still a teenager. He completed ''[[Disquisitiones Arithmeticae]]'', his [[magnum opus]], at the age of 21 (1798), though it would not be published until 1801. This work was fundamental in consolidating [[number theory]] as a discipline and has shaped the field to the present day. | ||
+ | |||
+ | ==Early years== | ||
+ | [[Image:Statue-of-Gauss-in-Braunschweig.jpg|left|thumb|Statue of Gauss in his birthplace of Brunswick.]] | ||
+ | Gauss was born in [[Braunschweig|Brunswick]], in the [[Duchy]] of [[Brunswick-Lüneburg]] (now part of [[Lower Saxony]], [[Germany]]), as the only son of poor working-class parents.<ref>{{cite web |url= http://www.math.wichita.edu/history/men/gauss.html|title= Carl Friedrich Gauss|accessmonthday= |accessyear= |last= |first= |date= |work= |publisher=Wichita State University }}</ref> There are several stories of his early genius, all of them open to doubt; according to one, his gifts became very apparent at the age of three when he corrected, in his head, an error his father had made on paper while calculating finances. | ||
+ | |||
+ | Another famous story, and one that has evolved in the telling, has it that in [[primary school]] his teacher, J.G. Büttner, tried to occupy pupils by making them add up the [[integer]]s from 1 to 100. The young Gauss produced the correct answer within seconds by a flash of mathematical insight, to the astonishment of his teacher and his assistant [[Johann Christian Martin Bartels|Martin Bartels]]. Gauss had realized that pairwise addition of terms from opposite ends of the list yielded identical intermediate sums: 1 + 100 = 101, 2 + 99 = 101, 3 + 98 = 101, and so on, for a total sum of 50 × 101 = 5050 (''see [[arithmetic series]] and [[summation]]'').<ref>http://www.americanscientist.org/template/AssetDetail/assetid/50686?&print=yes for discussion of original [[Wolfgang Sartorius von Waltershausen]] source.</ref> J. Rotman states in his book ''A first course in Abstract Algebra'' that he believes this incident never happened. | ||
+ | |||
+ | His father had wanted him to follow in his footsteps and become a [[Masonry|mason]]. He was not supportive of Gauss's schooling in mathematics and science. Gauss was primarily supported by his mother in this effort and by the [[Karl Wilhelm Ferdinand, Duke of Brunswick-Luneburg|Duke of Brunswick]],<ref name="scientificmonthly"/> who awarded Gauss a fellowship to the Collegium Carolinum (now [[Technische Universität Braunschweig]]), which he attended from [[1792]] to [[1795]], from where he moved to the [[University of Göttingen]] from [[1795]] to [[1798]]. While in university, Gauss independently rediscovered several important theorems;{{fact|date=July 2007}} his breakthrough occurred in 1796 when he was able to show that any regular [[polygon]] with a number of sides which is a [[Fermat prime]] (and, consequently, those polygons with any number of sides which is the product of distinct Fermat primes and a [[exponentiation|power]] of [[2 (number)|2]]) can be constructed by [[compass and straightedge]]. This was a major discovery in an important field of mathematics; construction problems had occupied mathematicians since the days of the [[Ancient Greece|Ancient Greeks]], and the discovery ultimately led Gauss to choose mathematics instead of philology as a career. Gauss was so pleased by this result that he requested that a regular [[heptadecagon]] be inscribed on his [[tomb stone|tombstone]]. The stonemason declined, stating that the difficult construction would essentially look like a circle. | ||
+ | |||
+ | 1796 was a most productive year for both Gauss and number theory. The construction of the [[heptadecagon]] was discovered on [[March 30]]. He invented [[modular arithmetic]], greatly simplifying manipulations in number theory. He became the first to prove the [[quadratic reciprocity]] law on [[April 8]]. This remarkably general law allows mathematicians to determine the solvability of any quadratic equation in modular arithmetic. The [[prime number theorem]], conjectured on [[May 31]], gives a good understanding of how the [[prime numbers]] are distributed among the integers. Gauss also discovered that every positive integer is representable as a sum of at most three [[triangular numbers]] on [[July 10]] and then jotted down in his diary the famous words, "[[Eureka (word)|Heureka]]! num= <math>\Delta+\Delta+\Delta</math>." On [[October 1]] he published a result on the number of solutions of polynomials with coefficients in finite fields (this ultimately led to the [[Weil conjectures]] 150 years later). | ||
+ | |||
+ | ==Middle years== | ||
+ | In his 1799 dissertation, ''A New Proof That Every Rational Integer Function of One Variable Can Be Resolved into Real Factors of the First or Second Degree'', Gauss gave a proof of the [[fundamental theorem of algebra]]. This important theorem states that every [[polynomial]] over the [[complex numbers]] must have at least one [[root (mathematics)|root]]. Other mathematicians had tried to prove this before him, e.g. [[Jean le Rond d'Alembert]]. Gauss's dissertation contained a critique of d'Alembert's proof, but his own attempt would not be accepted owing to implicit use of the [[Jordan curve theorem]]. Gauss over his lifetime produced three more proofs, probably due in part to this rejection of his dissertation; his last proof in 1849 is generally considered rigorous by today's standard. His attempts clarified the concept of [[complex number]]s considerably along the way. | ||
+ | |||
+ | Gauss also made important contributions to [[number theory]] with his 1801 book ''[[Disquisitiones Arithmeticae]]'', which contained a clean presentation of [[modular arithmetic]] and the first proof of the law of [[quadratic reciprocity]]. In that same year, [[Italy|Italian]] astronomer [[Giuseppe Piazzi]] discovered the [[dwarf planet]] [[1 Ceres|Ceres]], but could only watch it for a few days. [[Image:Disqvisitiones-800.jpg|thumb|Title page of Gauss's ''[[Disquisitiones Arithmeticae]]'']]Gauss predicted correctly the position at which it could be found again, and it was rediscovered by [[Franz Xaver von Zach]] on [[December 31]], [[1801]] in [[Gotha (town)|Gotha]], and one day later by [[Heinrich Wilhelm Matthäus Olbers|Heinrich Olbers]] in [[Bremen (city)|Bremen]]. Zach noted that "without the intelligent work and calculations of Doctor Gauss we might not have found Ceres again." Though Gauss had up to this point been supported by the stipend from the Duke, he doubted the security of this arrangement, and also did not believe pure mathematics to be important enough to deserve support. Thus he sought a position in astronomy, and in 1807 was appointed Professor of Astronomy and Director of the astronomical observatory in [[Göttingen]], a post he held for the remainder of his life. | ||
+ | |||
+ | The discovery of [[1 Ceres|Ceres]] by Piazzi on [[January 1]], [[1801]] led Gauss to his work on a theory of the motion of planetoids disturbed by large planets, eventually published in 1809 under the name ''Theoria motus corporum coelestium in sectionibus conicis solem ambientum'' (theory of motion of the celestial bodies moving in conic sections around the sun). Piazzi had only been able to track Ceres for a couple of months, following it for three degrees across the night sky. Then it disappeared temporarily behind the glare of the Sun. Several months later, when Ceres should have reappeared, Piazzi could not locate it: the mathematical tools of the time were not able to extrapolate a position from such a scant amount of data—three degrees represent less than 1% of the total orbit. | ||
+ | |||
+ | Gauss, who was 23 at the time, heard about the problem and tackled it. After three months of intense work, he predicted a position for Ceres in December 1801—- just about a year after its first sighting—and this turned out to be accurate within a half-degree. In the process, he so streamlined the cumbersome mathematics of 18th century orbital prediction that his work—- published a few years later as ''Theory of Celestial Movement''—- remains a cornerstone of astronomical computation.{{fact|date=July 2007}} It introduced the [[Gaussian gravitational constant]], and contained an influential treatment of the [[method of least squares]], a procedure used in all sciences to this day to minimize the impact of [[measurement error]]. Gauss was able to prove the method in 1809 under the assumption of [[normal distribution|normally distributed]] errors (see [[Gauss-Markov theorem]]; see also [[Gaussian]]). The method had been described earlier by [[Adrien-Marie Legendre]] in 1805, but Gauss claimed that he had been using it since 1795.{{fact|date=July 2007}} | ||
+ | [[Image:Bendixen - Carl Friedrich Gauß, 1828.jpg|thumb|Gauss' portrait published in ''Astronomische Nachrichten'' 1828]] | ||
+ | |||
+ | Gauss was a prodigious [[mental calculator]]. Reputedly, when asked how he had been able to predict the trajectory of Ceres with such accuracy he replied, "I used [[logarithms]]." The questioner then wanted to know how he had been able to look up so many numbers from the tables so quickly. "Look them up?" Gauss responded. "Who needs to look them up? I just calculate them in my head!" | ||
+ | |||
+ | In 1818 Gauss, putting his calculation skills to practical use, carried out a [[surveying|geodesic survey]] of the state of [[Hanover (state)|Hanover]], linking up with previous [[Denmark|Danish]] surveys. To aid in the survey, Gauss invented the [[heliotrope (instrument)|heliotrope]], an instrument that uses a mirror to reflect sunlight over great distances, to measure positions. | ||
+ | |||
+ | Gauss also claimed to have discovered the possibility of [[non-Euclidean geometry|non-Euclidean geometries]] but never published it. This discovery was a major paradigm shift in mathematics, as it freed mathematicians from the mistaken belief that Euclid's axioms were the only way to make geometry consistent and non-contradictory. Research on these geometries led to, among other things, [[Albert Einstein|Einstein]]'s theory of general relativity, which describes the universe as non-Euclidean. His friend [[Farkas Bolyai|Farkas Wolfgang Bolyai]] with whom Gauss had sworn "brotherhood and the banner of truth" as a student had tried in vain for many years to prove the parallel postulate from Euclid's other axioms of geometry. Bolyai's son, [[Janos Bolyai|János Bolyai]], discovered non-Euclidean geometry in 1829; his work was published in 1832. After seeing it, Gauss wrote to Farkas Bolyai: ''"To praise it would amount to praising myself. For the entire content of the work ... coincides almost exactly with my own meditations which have occupied my mind for the past thirty or thirty-five years."'' This unproved statement put a strain on his relationship with János Bolyai (who thought that Gauss was "stealing" his idea), but it is now generally taken at face value.{{fact|date=July 2007}} Letters by Gauss years before 1829 reveal him obscurely discussing the problem of parallel lines. Waldo Dunnington, in "Gauss, Titan of Science", successfully proves, however, that Gauss was in fact in full possession of non-Euclidian geometry long before it was published by János, but that he refused to publish any of it because of his fear of controversy. | ||
+ | |||
+ | [[Image:Normal distribution pdf.png|thumb|240px|right|Four [[normal distribution|Gaussian distributions]] in [[statistics]].]] | ||
+ | The survey of Hanover later led to the development of the Gaussian distribution, also known as the [[normal distribution]], for describing measurement errors. Moreover, it fuelled Gauss's interest in [[differential geometry]], a field of mathematics dealing with [[curve]]s and [[surface]]s. In this field, he came up in 1828 with an important theorem, the [[theorema egregium]] (''remarkable theorem'' in [[Latin]]) establishing an important property of the notion of [[curvature]]. Informally, the theorem says that the curvature of a surface can be determined entirely by measuring [[angle]]s and [[distance]]s on the surface; that is, curvature does not depend on how the surface might be [[embedding|embedded]] in (3-dimensional) space. | ||
+ | |||
+ | ==Later years, death, and afterwards== | ||
+ | In 1831 Gauss developed a fruitful collaboration with the physics professor [[Wilhelm Weber]]; it led to new knowledge in the field of [[magnetism]] (including finding a representation for the unit of magnetism in terms of mass, length and time) and the discovery of [[Kirchhoff's circuit laws]] in electricity. Gauss and Weber constructed the first [[Electrical telegraph|electromagnetic telegraph]] in 1833, which connected the observatory with the institute for physics in Göttingen. Gauss ordered a [[magnetic observatory]] to be built in the garden of the observatory and with Weber founded the ''magnetischer Verein'' ("magnetic club"), which supported measurements of earth's magnetic field in many regions of the world. He developed a method of measuring the horizontal intensity of the magnetic field which has been in use well into the second half of the 20th century and worked out the mathematical theory for separating the inner ([[planetary core|core]] and [[Crust (geology)|crust]]) and outer ([[magnetosphere|magnetospheric]]) sources of Earth's magnetic field. | ||
+ | |||
+ | Gauss died in [[Göttingen]], [[Hanover (state)|Hanover]] (now part of [[Lower Saxony]], [[Germany]]) in 1855 and is interred in the cemetery ''[[Albanifriedhof]]'' there. Two individuals gave eulogies at his funeral, Gauss's son-in-law [[Heinrich Ewald]] and [[Wolfgang Sartorius von Waltershausen]], who was Gauss's close friend and biographer. His brain was preserved and was studied by [[Rudolf Wagner]] who found its weight to be 1,492 grams and the cerebral area equal to 219,588 square centimeters (236.363 square feet). Highly developed convolutions were also found, which in the early 20th century was suggested as the explanation of his genius. <ref>(Dunnington, 1927)</ref> | ||
+ | |||
+ | ==Family== | ||
+ | Gauss's personal life was overshadowed by the early death of his first wife, Johanna Osthoff, in 1809, soon followed by the death of one child, Louis. Gauss plunged into a [[Clinical depression|depression]] from which he never fully recovered. He married again, to a friend of his first wife named Friederica Wilhelmine Waldeck (Minna), but this second marriage does not seem to have been very happy as it was plagued by Minna's continuous illness.{{fact|date=July 2007}} When his second wife died in 1831 after a long illness, one of his daughters, Therese, took over the household and cared for Gauss until the end of his life. His mother lived in his house from 1817 until her death in 1839.<ref name="scientificmonthly"/> | ||
+ | |||
+ | Gauss had six children. With Johanna (1780–1809), his children were Joseph (1806–1873), Wilhelmina (1808–1846) and Louis (1809–1810). Of all of Gauss's children, Wilhelmina was said to have come closest to his talent, but she died young. With Minna Waldeck he also had three children: Eugene (1811–1896), Wilhelm (1813–1879) and Therese (1816–1864). Eugene emigrated to the [[United States]] about 1832 after a falling out with his father, eventually settling in [[Saint Charles, Missouri|St. Charles]], [[Missouri]], where he became a well-respected member of the community.{{fact|date=July 2007}} Wilhelm also settled in Missouri, starting as a [[farmer]] and later becoming wealthy in the shoe business in [[St. Louis, Missouri|St. Louis]]. Therese kept house for Gauss until his death, after which she married. | ||
+ | |||
+ | Gauss eventually had conflicts with his sons, two of whom migrated to the United States. He did not want any of his sons to enter mathematics or science for "fear of sullying the family name". His conflict with Eugene was particularly bitter.{{fact|date=July 2007}} Gauss wanted Eugene to become a [[lawyer]], but Eugene wanted to study languages. They had an argument over a party Eugene held, which Gauss refused to pay for. The son left in anger and immigrated to the United States, where he was quite successful. It took many years for Eugene's success to counteract his reputation among Gauss's friends and colleagues. See also [[s:Robert Gauss to Felix Klein - September 3, 1912|the letter from Robert Gauss to Felix Klein]] on [[September 3]], [[1912]]. | ||
+ | |||
+ | ==Personality== | ||
+ | Gauss was an ardent [[perfectionism (psychology)|perfectionist]] and a hard worker. According to [[Isaac Asimov]], Gauss was once interrupted in the middle of a problem and told that his wife was dying. He is purported to have said, "Tell her to wait a moment till I'm done."<ref>{{cite book | ||
+ | | last = Asimov | first = I. | ||
+ | | title = Biographical Encyclopedia of Science and Technology; the Lives and Achievements of 1195 Great Scientists from Ancient Times to the Present, Chronologically Arranged. | ||
+ | | location = New York | ||
+ | | publisher = Doubleday | ||
+ | | date = 1972 | ||
+ | }}</ref> This anecdote is briefly discussed in W. Dunnington's "Gauss, Titan of Science" where it is suggested that it is an apocryphal story. | ||
+ | |||
+ | He was never a prolific writer, refusing to publish works which he did not consider complete and above criticism. This was in keeping with his personal motto "pauca sed matura" (few, but ripe). A study of his personal diaries reveals that he had in fact discovered several important mathematical concepts years or decades before they were published by his contemporaries. Prominent mathematical historian [[Eric Temple Bell]] estimated that had Gauss made known all of his discoveries, mathematics would have been advanced by 50 years.<ref>{{cite book | ||
+ | | last = Bell | first = E. T. | ||
+ | | chapter = Ch. 14: The Prince of Mathematicians: Gauss | ||
+ | | title = Men of Mathematics: The Lives and Achievements of the Great Mathematicians from Zeno to Poincaré | ||
+ | | location = New York | ||
+ | | publisher = Simon and Schuster | ||
+ | | pages = pp. 218–269 | ||
+ | | date = 1986 | ||
+ | | id = ISBN 0-671-46400-0 | ||
+ | }}</ref> | ||
+ | |||
+ | A criticism of Gauss is that he did not support the younger mathematicians who followed him. He rarely, if ever, collaborated with other mathematicians and was considered aloof and austere by many.{{fact|date=July 2007}} Though he did take in a few students, Gauss was known to dislike teaching. It is said that he attended only a single scientific conference, which was in [[Berlin]] in 1828. However, several of his students became influential mathematicians, among them [[Richard Dedekind]], [[Bernhard Riemann]], and [[Friedrich Bessel]]. Before she died, [[Sophie Germain]] was recommended by Gauss to receive her honorary degree. | ||
+ | |||
+ | Gauss usually declined to present the intuition behind his often very elegant proofs—-he preferred them to appear "out of thin air" and erased all traces of how he discovered them.{{fact|date=July 2007}} This is fully, however briefly, explained by Gauss himself in his "Disquisitiones Arithmeticae", where he states that all analysis (i.e. the paths one travelled to reach the solution of a problem) must be suppressed for sake of brevity. | ||
+ | |||
+ | Gauss was deeply religious and conservative.{{fact|date=July 2007}} He supported monarchy and opposed [[Napoleon I of France|Napoleon]], whom he saw as an outgrowth of [[revolution]]. | ||
+ | |||
+ | ==Commemorations== | ||
+ | The [[Centimeter gram second system of units|cgs]] [[units of measurement|unit]] for [[Electromagnetic induction|magnetic induction]] was named [[Gauss (unit)|gauss]] in his honour. | ||
+ | |||
+ | [[Image:Gauss-10DM.jpg|200px|right|thumb|10 [[Deutsche Mark]] − German banknote featuring Gauss]] | ||
+ | |||
+ | From 1989 until the end of 2001, his portrait and a normal distribution curve as well as some prominent buildings of [[Göttingen]] were featured on the German ten-mark banknote. The other side of the note features the [[Heliotrope (instrument)|heliotrope]] and a [[triangulation]] approach for [[Hannover]]. Germany has issued three stamps honouring Gauss, as well. A righteous stamp (no. 725), was issued in 1955 on the hundredth anniversary of his death; two other stamps, no. 1246 and 1811, were issued in 1977, the 200th anniversary of his birth. | ||
+ | |||
+ | In 2007, his [[Bust (sculpture)|bust]] was introduced to the [[Walhalla temple|Walhalla]]. | ||
+ | |||
+ | Places, vessels and events named in honour of Gauss: | ||
+ | |||
+ | * [[Gauss (crater)|Gauss crater]] on the [[Moon]] | ||
+ | * [[Asteroid]] [[1001 Gaussia]]. | ||
+ | * The ship ''[[Gauss (ship)|Gauss]]'', used in the [[Gauss expedition]] to the Antarctic. | ||
+ | * [[Gaussberg]], an extinct volcano discovered by the above mentioned expedition | ||
+ | * [[Gauss Tower]], an observation tower | ||
+ | * In Canadian junior high schools, an annual national mathematics competition administered by the [[Centre for Education in Mathematics and Computing]] is named in honour of Gauss. | ||
+ | * In [[Crown College, University of California, Santa Cruz|University of California, Santa Cruz, in Crown College]], a dormitory building is named after Gauss. | ||
+ | * The Gauss Haus, an [[NMR]] center at the [[University of Utah]]. | ||
+ | |||
+ | ==See also== | ||
+ | *[[List of topics named after Carl Friedrich Gauss]] | ||
+ | |||
+ | ==References== | ||
+ | ===Notes=== | ||
+ | {{reflist}} | ||
+ | |||
+ | ===Further reading=== | ||
+ | * {{cite web | ||
+ | | title = Carl Friedrich Gauss | ||
+ | | url = http://www.geocities.com/RainForest/Vines/2977/gauss/english.html | ||
+ | | accessmonthday=June| accessyear = 2005 | ||
+ | }} | ||
+ | * {{planetmath reference | id = 5594 | title = Carl Friedrich Gauss }} | ||
+ | * {{cite book | ||
+ | | last = Dunnington | ||
+ | | first = G. Waldo. | ||
+ | | title = Carl Friedrich Gauss: Titan of Science | ||
+ | | publisher = The Mathematical Association of America | ||
+ | | date = June 2003 | ||
+ | | id = ISBN 0-88385-547-X | ||
+ | }} | ||
+ | * {{cite book | ||
+ | | last = Gauss | ||
+ | | first = Carl Friedrich | ||
+ | | others = tr. Arthur A. Clarke | ||
+ | | title = [[Disquisitiones Arithmeticae]] | ||
+ | | publisher = Yale University Press | ||
+ | | date = 1965 | ||
+ | | id = ISBN 0-300-09473-6 | ||
+ | }} | ||
+ | * {{cite book | ||
+ | | last = Hall | ||
+ | | first = T. | ||
+ | | title = Carl Friedrich Gauss: A Biography | ||
+ | | location = Cambridge, MA | ||
+ | | publisher = MIT Press | ||
+ | | date = 1970 | ||
+ | | id = ISBN 0-262-08040-0 | ||
+ | }} | ||
+ | * {{cite web | ||
+ | | title = Gauss and His Children | ||
+ | | url = http://www.gausschildren.org | ||
+ | | accessmonthday=June| accessyear = 2005 | ||
+ | }} | ||
+ | * {{cite book | ||
+ | | last = Simmons | ||
+ | | first = J. | ||
+ | | title = The Giant Book of Scientists: The 100 Greatest Minds of All Time | ||
+ | | location = Sydney | ||
+ | | publisher = The Book Company | ||
+ | | date = 1996 | ||
+ | }} | ||
+ | |||
+ | ==External links== | ||
+ | {{wikiquote}} | ||
+ | {{commons|Johann Carl Friedrich Gauß}} | ||
+ | {{wikisource author|Carl Friedrich Gauss}} | ||
+ | * [http://www.corrosion-doctors.org/Biographies/GaussBio.htm Gauss biography] | ||
+ | * {{MacTutor Biography|id=Gauss}} | ||
+ | *{{MathGenealogy|id=18231}} | ||
+ | * [http://fermatslasttheorem.blogspot.com/2005/06/carl-friedrich-gauss.html Carl Friedrich Gauss], Biography at [http://fermatslasttheorem.blogspot.com Fermat's Last Theorem Blog]. | ||
+ | * [http://www.idsia.ch/~juergen/gauss.html Gauss: mathematician of the millennium], by [[Juergen Schmidhuber]] | ||
+ | * [http://www.gauss.info Gauss], general information, submit your site about Gauss. | ||
+ | * Obituary: [http://adsabs.harvard.edu//full/seri/MNRAS/0016//0000080.000.html MNRAS '''16''' (1856) 80] | ||
+ | * [http://www.americanscientist.org/template/AssetDetail/assetid/50686?&print=yes A discussion of childhood problem and the sources] | ||
+ | * [http://www-gdz.sub.uni-goettingen.de/cgi-bin/digbib.cgi?PPN235957348 Complete works] | ||
+ | * [http://www-personal.umich.edu/~jbourj/money1.htm Carl Friedrich Gauss on the 10 Deutsch Mark banknote.] | ||
+ | |||
+ | ==Further reading== | ||
+ | |||
+ | * {{cite book | ||
+ | | last = Kehlmann | ||
+ | | first = Daniel | ||
+ | | title = [[Measuring the World|Die Vermessung der Welt]] | ||
+ | | publisher = Rowohlt | ||
+ | | date = 2005 | ||
+ | | id = ISBN 3-498-03528-2 | ||
+ | }} | ||
+ | |||
+ | {{s-start}} | ||
+ | {{s-awards}} | ||
+ | {{s-bef|before=[[Antoine César Becquerel]] and [[John Frederic Daniell]]}} | ||
+ | {{s-ttl|title=[[Copley Medal]]|years=1838<br/>''jointly with [[Michael Faraday]]''}} | ||
+ | {{s-aft|after=[[Robert Brown (botanist)|Robert Brown]]}} | ||
+ | {{s-end}} | ||
+ | |||
+ | {{Enlightenment}} | ||
+ | <!-- Metadata: see [[Wikipedia:Persondata]] --> | ||
+ | |||
+ | {{Persondata | ||
+ | |NAME= Gauss, Johann Carl Friedrich | ||
+ | |ALTERNATIVE NAMES= | ||
+ | |SHORT DESCRIPTION= [[Mathematics|Mathematician]] and [[Physics|physicist]] | ||
+ | |DATE OF BIRTH= {{birth date|1777|4|30|df=y}} | ||
+ | |PLACE OF BIRTH= [[Braunschweig|Brunswick]], [[Germany]] | ||
+ | |DATE OF DEATH= {{death date|1855|2|23|df=y}} | ||
+ | |PLACE OF DEATH= [[Göttingen]], [[Hanover]], [[Germany]] | ||
+ | }} | ||
+ | {{DEFAULTSORT:Gauss, Carl Friedrich}} | ||
+ | [[Category:German mathematicians]] | ||
+ | [[Category:Differential geometers]] | ||
+ | [[Category:Number theorists]] | ||
+ | [[Category:18th century mathematicians]] | ||
+ | [[Category:19th century mathematicians]] | ||
+ | [[Category:Georg-August University of Göttingen faculty]] | ||
+ | [[Category:Calculating prodigies]] | ||
+ | [[Category:German scientists]] | ||
+ | [[Category:German astronomers]] | ||
+ | [[Category:German physicists]] | ||
+ | [[Category:Christian people]] | ||
+ | [[Category:Walhalla enshrinees]] | ||
+ | [[Category:People from Braunschweig]] | ||
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Revision as of 23:03, 5 January 2008
This is an AoPSWiki Word of the Week for Jan 3-9 |
Carl Friedrich Gauss was a German mathematician and scientist who lived from April 30, 1777 to February 23, 1855.
Among his many accomplishments were quickly calculating the sum of the integers 1-100 in the first grade and proving that a 17-gon was constructable. He even asked for a 17-gon to be put on his tombstone.
Template:Infobox Scientist Johann Carl Friedrich Gauss (Template:PronEng, Template:Audio; in German usually Gauß, Template:Lang-la) (30 April 1777 – 23 February 1855) was a German mathematician and scientist who contributed significantly to many fields, including number theory, statistics, analysis, differential geometry, geodesy, electrostatics, astronomy, and optics. Sometimes known as "the prince of mathematicians" and "greatest mathematician since antiquity", Gauss had a remarkable influence in many fields of mathematics and science and is ranked as one of history's most influential mathematicians.<ref name="scientificmonthly">Dunnington, G. Waldo. (May, 1927). "The Sesquicentennial of the Birth of Gauss". Scientific Monthly XXIV: 402–414. Retrieved on 29 June 2005. Comprehensive biographical article.</ref>
Gauss was a child prodigy, of whom there are many anecdotes pertaining to his astounding precocity while a mere toddler, and made his first ground-breaking mathematical discoveries while still a teenager. He completed Disquisitiones Arithmeticae, his magnum opus, at the age of 21 (1798), though it would not be published until 1801. This work was fundamental in consolidating number theory as a discipline and has shaped the field to the present day.
Contents
Early years
Gauss was born in Brunswick, in the Duchy of Brunswick-Lüneburg (now part of Lower Saxony, Germany), as the only son of poor working-class parents.<ref>Template:Cite web</ref> There are several stories of his early genius, all of them open to doubt; according to one, his gifts became very apparent at the age of three when he corrected, in his head, an error his father had made on paper while calculating finances.
Another famous story, and one that has evolved in the telling, has it that in primary school his teacher, J.G. Büttner, tried to occupy pupils by making them add up the integers from 1 to 100. The young Gauss produced the correct answer within seconds by a flash of mathematical insight, to the astonishment of his teacher and his assistant Martin Bartels. Gauss had realized that pairwise addition of terms from opposite ends of the list yielded identical intermediate sums: 1 + 100 = 101, 2 + 99 = 101, 3 + 98 = 101, and so on, for a total sum of 50 × 101 = 5050 (see arithmetic series and summation).<ref>http://www.americanscientist.org/template/AssetDetail/assetid/50686?&print=yes for discussion of original Wolfgang Sartorius von Waltershausen source.</ref> J. Rotman states in his book A first course in Abstract Algebra that he believes this incident never happened.
His father had wanted him to follow in his footsteps and become a mason. He was not supportive of Gauss's schooling in mathematics and science. Gauss was primarily supported by his mother in this effort and by the Duke of Brunswick,<ref name="scientificmonthly"/> who awarded Gauss a fellowship to the Collegium Carolinum (now Technische Universität Braunschweig), which he attended from 1792 to 1795, from where he moved to the University of Göttingen from 1795 to 1798. While in university, Gauss independently rediscovered several important theorems;Template:Fact his breakthrough occurred in 1796 when he was able to show that any regular polygon with a number of sides which is a Fermat prime (and, consequently, those polygons with any number of sides which is the product of distinct Fermat primes and a power of 2) can be constructed by compass and straightedge. This was a major discovery in an important field of mathematics; construction problems had occupied mathematicians since the days of the Ancient Greeks, and the discovery ultimately led Gauss to choose mathematics instead of philology as a career. Gauss was so pleased by this result that he requested that a regular heptadecagon be inscribed on his tombstone. The stonemason declined, stating that the difficult construction would essentially look like a circle.
1796 was a most productive year for both Gauss and number theory. The construction of the heptadecagon was discovered on March 30. He invented modular arithmetic, greatly simplifying manipulations in number theory. He became the first to prove the quadratic reciprocity law on April 8. This remarkably general law allows mathematicians to determine the solvability of any quadratic equation in modular arithmetic. The prime number theorem, conjectured on May 31, gives a good understanding of how the prime numbers are distributed among the integers. Gauss also discovered that every positive integer is representable as a sum of at most three triangular numbers on July 10 and then jotted down in his diary the famous words, "Heureka! num= ." On October 1 he published a result on the number of solutions of polynomials with coefficients in finite fields (this ultimately led to the Weil conjectures 150 years later).
Middle years
In his 1799 dissertation, A New Proof That Every Rational Integer Function of One Variable Can Be Resolved into Real Factors of the First or Second Degree, Gauss gave a proof of the fundamental theorem of algebra. This important theorem states that every polynomial over the complex numbers must have at least one root. Other mathematicians had tried to prove this before him, e.g. Jean le Rond d'Alembert. Gauss's dissertation contained a critique of d'Alembert's proof, but his own attempt would not be accepted owing to implicit use of the Jordan curve theorem. Gauss over his lifetime produced three more proofs, probably due in part to this rejection of his dissertation; his last proof in 1849 is generally considered rigorous by today's standard. His attempts clarified the concept of complex numbers considerably along the way.
Gauss also made important contributions to number theory with his 1801 book Disquisitiones Arithmeticae, which contained a clean presentation of modular arithmetic and the first proof of the law of quadratic reciprocity. In that same year, Italian astronomer Giuseppe Piazzi discovered the dwarf planet Ceres, but could only watch it for a few days.
Gauss predicted correctly the position at which it could be found again, and it was rediscovered by Franz Xaver von Zach on December 31, 1801 in Gotha, and one day later by Heinrich Olbers in Bremen. Zach noted that "without the intelligent work and calculations of Doctor Gauss we might not have found Ceres again." Though Gauss had up to this point been supported by the stipend from the Duke, he doubted the security of this arrangement, and also did not believe pure mathematics to be important enough to deserve support. Thus he sought a position in astronomy, and in 1807 was appointed Professor of Astronomy and Director of the astronomical observatory in Göttingen, a post he held for the remainder of his life.
The discovery of Ceres by Piazzi on January 1, 1801 led Gauss to his work on a theory of the motion of planetoids disturbed by large planets, eventually published in 1809 under the name Theoria motus corporum coelestium in sectionibus conicis solem ambientum (theory of motion of the celestial bodies moving in conic sections around the sun). Piazzi had only been able to track Ceres for a couple of months, following it for three degrees across the night sky. Then it disappeared temporarily behind the glare of the Sun. Several months later, when Ceres should have reappeared, Piazzi could not locate it: the mathematical tools of the time were not able to extrapolate a position from such a scant amount of data—three degrees represent less than 1% of the total orbit.
Gauss, who was 23 at the time, heard about the problem and tackled it. After three months of intense work, he predicted a position for Ceres in December 1801—- just about a year after its first sighting—and this turned out to be accurate within a half-degree. In the process, he so streamlined the cumbersome mathematics of 18th century orbital prediction that his work—- published a few years later as Theory of Celestial Movement—- remains a cornerstone of astronomical computation.Template:Fact It introduced the Gaussian gravitational constant, and contained an influential treatment of the method of least squares, a procedure used in all sciences to this day to minimize the impact of measurement error. Gauss was able to prove the method in 1809 under the assumption of normally distributed errors (see Gauss-Markov theorem; see also Gaussian). The method had been described earlier by Adrien-Marie Legendre in 1805, but Gauss claimed that he had been using it since 1795.Template:Fact
Gauss was a prodigious mental calculator. Reputedly, when asked how he had been able to predict the trajectory of Ceres with such accuracy he replied, "I used logarithms." The questioner then wanted to know how he had been able to look up so many numbers from the tables so quickly. "Look them up?" Gauss responded. "Who needs to look them up? I just calculate them in my head!"
In 1818 Gauss, putting his calculation skills to practical use, carried out a geodesic survey of the state of Hanover, linking up with previous Danish surveys. To aid in the survey, Gauss invented the heliotrope, an instrument that uses a mirror to reflect sunlight over great distances, to measure positions.
Gauss also claimed to have discovered the possibility of non-Euclidean geometries but never published it. This discovery was a major paradigm shift in mathematics, as it freed mathematicians from the mistaken belief that Euclid's axioms were the only way to make geometry consistent and non-contradictory. Research on these geometries led to, among other things, Einstein's theory of general relativity, which describes the universe as non-Euclidean. His friend Farkas Wolfgang Bolyai with whom Gauss had sworn "brotherhood and the banner of truth" as a student had tried in vain for many years to prove the parallel postulate from Euclid's other axioms of geometry. Bolyai's son, János Bolyai, discovered non-Euclidean geometry in 1829; his work was published in 1832. After seeing it, Gauss wrote to Farkas Bolyai: "To praise it would amount to praising myself. For the entire content of the work ... coincides almost exactly with my own meditations which have occupied my mind for the past thirty or thirty-five years." This unproved statement put a strain on his relationship with János Bolyai (who thought that Gauss was "stealing" his idea), but it is now generally taken at face value.Template:Fact Letters by Gauss years before 1829 reveal him obscurely discussing the problem of parallel lines. Waldo Dunnington, in "Gauss, Titan of Science", successfully proves, however, that Gauss was in fact in full possession of non-Euclidian geometry long before it was published by János, but that he refused to publish any of it because of his fear of controversy.
The survey of Hanover later led to the development of the Gaussian distribution, also known as the normal distribution, for describing measurement errors. Moreover, it fuelled Gauss's interest in differential geometry, a field of mathematics dealing with curves and surfaces. In this field, he came up in 1828 with an important theorem, the theorema egregium (remarkable theorem in Latin) establishing an important property of the notion of curvature. Informally, the theorem says that the curvature of a surface can be determined entirely by measuring angles and distances on the surface; that is, curvature does not depend on how the surface might be embedded in (3-dimensional) space.
Later years, death, and afterwards
In 1831 Gauss developed a fruitful collaboration with the physics professor Wilhelm Weber; it led to new knowledge in the field of magnetism (including finding a representation for the unit of magnetism in terms of mass, length and time) and the discovery of Kirchhoff's circuit laws in electricity. Gauss and Weber constructed the first electromagnetic telegraph in 1833, which connected the observatory with the institute for physics in Göttingen. Gauss ordered a magnetic observatory to be built in the garden of the observatory and with Weber founded the magnetischer Verein ("magnetic club"), which supported measurements of earth's magnetic field in many regions of the world. He developed a method of measuring the horizontal intensity of the magnetic field which has been in use well into the second half of the 20th century and worked out the mathematical theory for separating the inner (core and crust) and outer (magnetospheric) sources of Earth's magnetic field.
Gauss died in Göttingen, Hanover (now part of Lower Saxony, Germany) in 1855 and is interred in the cemetery Albanifriedhof there. Two individuals gave eulogies at his funeral, Gauss's son-in-law Heinrich Ewald and Wolfgang Sartorius von Waltershausen, who was Gauss's close friend and biographer. His brain was preserved and was studied by Rudolf Wagner who found its weight to be 1,492 grams and the cerebral area equal to 219,588 square centimeters (236.363 square feet). Highly developed convolutions were also found, which in the early 20th century was suggested as the explanation of his genius. <ref>(Dunnington, 1927)</ref>
Family
Gauss's personal life was overshadowed by the early death of his first wife, Johanna Osthoff, in 1809, soon followed by the death of one child, Louis. Gauss plunged into a depression from which he never fully recovered. He married again, to a friend of his first wife named Friederica Wilhelmine Waldeck (Minna), but this second marriage does not seem to have been very happy as it was plagued by Minna's continuous illness.Template:Fact When his second wife died in 1831 after a long illness, one of his daughters, Therese, took over the household and cared for Gauss until the end of his life. His mother lived in his house from 1817 until her death in 1839.<ref name="scientificmonthly"/>
Gauss had six children. With Johanna (1780–1809), his children were Joseph (1806–1873), Wilhelmina (1808–1846) and Louis (1809–1810). Of all of Gauss's children, Wilhelmina was said to have come closest to his talent, but she died young. With Minna Waldeck he also had three children: Eugene (1811–1896), Wilhelm (1813–1879) and Therese (1816–1864). Eugene emigrated to the United States about 1832 after a falling out with his father, eventually settling in St. Charles, Missouri, where he became a well-respected member of the community.Template:Fact Wilhelm also settled in Missouri, starting as a farmer and later becoming wealthy in the shoe business in St. Louis. Therese kept house for Gauss until his death, after which she married.
Gauss eventually had conflicts with his sons, two of whom migrated to the United States. He did not want any of his sons to enter mathematics or science for "fear of sullying the family name". His conflict with Eugene was particularly bitter.Template:Fact Gauss wanted Eugene to become a lawyer, but Eugene wanted to study languages. They had an argument over a party Eugene held, which Gauss refused to pay for. The son left in anger and immigrated to the United States, where he was quite successful. It took many years for Eugene's success to counteract his reputation among Gauss's friends and colleagues. See also the letter from Robert Gauss to Felix Klein on September 3, 1912.
Personality
Gauss was an ardent perfectionist and a hard worker. According to Isaac Asimov, Gauss was once interrupted in the middle of a problem and told that his wife was dying. He is purported to have said, "Tell her to wait a moment till I'm done."<ref>Template:Cite book</ref> This anecdote is briefly discussed in W. Dunnington's "Gauss, Titan of Science" where it is suggested that it is an apocryphal story.
He was never a prolific writer, refusing to publish works which he did not consider complete and above criticism. This was in keeping with his personal motto "pauca sed matura" (few, but ripe). A study of his personal diaries reveals that he had in fact discovered several important mathematical concepts years or decades before they were published by his contemporaries. Prominent mathematical historian Eric Temple Bell estimated that had Gauss made known all of his discoveries, mathematics would have been advanced by 50 years.<ref>Template:Cite book</ref>
A criticism of Gauss is that he did not support the younger mathematicians who followed him. He rarely, if ever, collaborated with other mathematicians and was considered aloof and austere by many.Template:Fact Though he did take in a few students, Gauss was known to dislike teaching. It is said that he attended only a single scientific conference, which was in Berlin in 1828. However, several of his students became influential mathematicians, among them Richard Dedekind, Bernhard Riemann, and Friedrich Bessel. Before she died, Sophie Germain was recommended by Gauss to receive her honorary degree.
Gauss usually declined to present the intuition behind his often very elegant proofs—-he preferred them to appear "out of thin air" and erased all traces of how he discovered them.Template:Fact This is fully, however briefly, explained by Gauss himself in his "Disquisitiones Arithmeticae", where he states that all analysis (i.e. the paths one travelled to reach the solution of a problem) must be suppressed for sake of brevity.
Gauss was deeply religious and conservative.Template:Fact He supported monarchy and opposed Napoleon, whom he saw as an outgrowth of revolution.
Commemorations
The cgs unit for magnetic induction was named gauss in his honour.
From 1989 until the end of 2001, his portrait and a normal distribution curve as well as some prominent buildings of Göttingen were featured on the German ten-mark banknote. The other side of the note features the heliotrope and a triangulation approach for Hannover. Germany has issued three stamps honouring Gauss, as well. A righteous stamp (no. 725), was issued in 1955 on the hundredth anniversary of his death; two other stamps, no. 1246 and 1811, were issued in 1977, the 200th anniversary of his birth.
In 2007, his bust was introduced to the Walhalla.
Places, vessels and events named in honour of Gauss:
- Gauss crater on the Moon
- Asteroid 1001 Gaussia.
- The ship Gauss, used in the Gauss expedition to the Antarctic.
- Gaussberg, an extinct volcano discovered by the above mentioned expedition
- Gauss Tower, an observation tower
- In Canadian junior high schools, an annual national mathematics competition administered by the Centre for Education in Mathematics and Computing is named in honour of Gauss.
- In University of California, Santa Cruz, in Crown College, a dormitory building is named after Gauss.
- The Gauss Haus, an NMR center at the University of Utah.
See also
References
Notes
Further reading
- Template:Cite web
- Template:Planetmath reference
- Template:Cite book
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External links
Template:Wikiquote Template:Commons Template:Wikisource author
- Gauss biography
- Template:MacTutor Biography
- Template:MathGenealogy
- Carl Friedrich Gauss, Biography at Fermat's Last Theorem Blog.
- Gauss: mathematician of the millennium, by Juergen Schmidhuber
- Gauss, general information, submit your site about Gauss.
- Obituary: MNRAS 16 (1856) 80
- A discussion of childhood problem and the sources
- Complete works
- Carl Friedrich Gauss on the 10 Deutsch Mark banknote.
Further reading
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Template:Link FA Template:Link FA ar:كارل فريدرش غاوس ast:Carl Friedrich Gauss az:Karl Qauss bn:কার্ল ফ্রিড্রিশ গাউস bs:Carl Friedrich Gauss br:Carl Friedrich Gauss bg:Карл Фридрих Гаус ca:Carl Friedrich Gauß cs:Carl Friedrich Gauss da:Carl Friedrich Gauss de:Carl Friedrich Gauß el:Καρλ Φρίντριχ Γκάους es:Carl Friedrich Gauss eo:Carl Friedrich Gauss eu:Carl Friedrich Gauss fa:کارل فریدریش گاوس fr:Carl Friedrich Gauss gl:Carl Friedrich Gauss zh-classical:高斯 ko:카를 프리드리히 가우스 hr:Carl Friedrich Gauss io:Carl Friedrich Gauss id:Carl Friedrich Gauss is:Carl Friedrich Gauss it:Carl Friedrich Gauss he:קרל פרידריך גאוס ka:კარლ ფრიდრიხ გაუსი la:Carolus Fridericus Gauss lv:Kārlis Frīdrihs Gauss lb:Carl Friedrich Gauß lt:Carl Friedrich Gauß hu:Carl Friedrich Gauss mr:कार्ल फ्रिदरिश गाउस nl:Carl Friedrich Gauss ja:カール・フリードリヒ・ガウス no:Carl Friedrich Gauss oc:Carl Friedrich Gauss pms:Carl Friedrich Gauss pl:Carl Friedrich Gauss pt:Carl Friedrich Gauss ro:Carl Friedrich Gauss ru:Гаусс, Карл Фридрих sco:Carl Friedrich Gauss sq:Carl Friedrich Gauss scn:Karl Friedrich Gauss simple:Carl Friedrich Gauss sk:Carl Friedrich Gauß sl:Carl Friedrich Gauss sr:Карл Фридрих Гаус sh:Karl Friedrich Gauss fi:Carl Friedrich Gauss sv:Carl Friedrich Gauss tl:Karl Friedrich Gauss ta:கார்ல் ஃப்ரெடெரிக் காஸ் th:คาร์ล ฟรีดริช เกาส์ vi:Carl Friedrich Gauß tr:Carl Friedrich Gauss uk:Ґаусс Карл Фрідріх zh:卡爾·弗里德里希·高斯
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