Difference between revisions of "Algebra"

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In [[mathematics]], '''algebra''' is the study of examining, manipulating, and solving [[equation]]s, [[inequality|inequalities]], and other [[mathematical expression]]s. Algebra revolves around the concept of the [[variable]], an unknown quantity given a name and usually denoted by a letter or symbol. Many contest problems test one's fluency with [[algebraic manipulation]].  If this is not what you are looking for, you might try the page on [[abstract algebra]].
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== Overview ==
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In [[mathematics]], '''algebra''' can denote many things.  As a subject, it generally denotes the study of calculations on some set.  In high school, this can the study of examining, manipulating, and solving [[equation]]s, [[inequality|inequalities]], and other [[mathematical expression]]s. Algebra revolves around the concept of the [[variable]], an unknown quantity given a name and usually denoted by a letter or symbol. Many contest problems test one's fluency with [[algebraic manipulation]].
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Algebra can be used to solve different types of equations, but algebra is also many other things
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'''Modern algebra''' (or "higher", or "abstract" algebra) deals (in part) with generalisations of the normal operations seen arithmetic and high school algebra[[Group]]s, [[ring]]s, [[field]]s, [[module]]s, and [[vector space]]s are common objects of study in higher algebra.
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'''Algebra Involving Equation'''
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Algebra can be used to solve equations as simple as 3x=9 but in some cases so complex that mathematicians have not figured how to solve the particular equation yet.
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As if to add to the confusion, "[[algebra (structure) |algebra]]" is the name for a certain kind of structure in modern algebra.
  
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Modern algebra also arguably contains the field of [[number theory]], which has important applications in computer science. (It is commonly claimed that the NSA is the largest employer in the USA of mathematicians, due to the applications of number theory to cryptanalysis.)  However, number theory concerns itself with a specific structure (the [[ring]] <math>\mathbb{Z}</math>), whereas algebra in general deals with general classes of structure.  Furthermore, number theory interacts more specifically with
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certain areas of mathematics (e.g., [[analysis]]) than does algebra in general.  Indeed, number theory
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is traditionally divided into different branches, the most prominent of which are
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[[algebraic number theory]] and [[analytic number theory]].
  
== Introductory Topics ==
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== Study Guides to Algebra ==
* [[Algebraic expression | Algebraic expressions]]
 
** [[Algebraic manipulation]]
 
** [[Substitution]]
 
* [[Complex number | Complex numbers]]
 
* [[Equation | Equations]]
 
** [[Linear equation | Linear equations]] (1 and 2 variables)
 
** [[System of equations | Systems of equations]]
 
* [[Factoring]]
 
* [[Function | Functions]]
 
** [[Exponential function | Exponentials]]
 
** [[Graph | Graphing]]
 
*** [[Line | Lines]]
 
*** [[Quadratic | Quadratics]]
 
*** Basic [[Transformation | Transformations]]
 
** [[Logarithm | Logarithms]]
 
** [[Square root]] function
 
** [[Polynomial | Polynomials]]
 
*** [[Quadratic | Quadratics]]
 
* [[Inequality | Inequalities]]
 
** [[Trivial inequality]]
 
** [[Arithmetic Mean-Geometric Mean]] for n=2
 
* [[Word problem | Word problems]]
 
  
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* [[Algebra/Introduction | Introductory topics in algebra]]
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* [[Algebra/Intermediate | Intermediate topics in algebra]]
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* [[Algebra/Olympiad | Olympiad topics in algebra]]
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* [[Algebra/Advanced topics | More advanced topics in algebra]]
  
== Intermediate Topics ==
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== Recommended AoPS books ==
* [[Equation | Equations]]
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*Introduction to Algebra [http://www.artofproblemsolving.com/Books/AoPS_B_Item.php?item_id=200]
** [[System of equations | Systems of equations]]
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*Intermediate Algebra [http://www.artofproblemsolving.com/Books/AoPS_B_Item.php?item_id=300]
* [[Factoring]]
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Competition math for middle school
** [[Simon's Favorite Factoring Trick]]
 
* [[Function | Functions]]
 
** [[Exponential function | Exponentials]]
 
** [[Greatest integer function]]
 
** [[Graph | Graphing]]
 
** [[Least integer function]]
 
** [[Logarithm | Logarithms]]
 
** [[Polynomial | Polynomials]]
 
** [[Functional equation| Functional Equations]]
 
* [[Inequality | Inequalities]]
 
** [[Trivial inequality]]
 
** [[Cauchy-Schwarz Inequality]]
 
** [[Arithmetic Mean-Geometric Mean | Arithmetic Mean-Geometric Mean Inequality]]
 
** [[Triangle Inequality]]
 
* [[Newton sums]]
 
* [[Trigonometry]]
 
** [[DeMoivre's Theorem]]
 
** [[Roots of unity]]
 
  
== Olympiad Topics==
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== See also ==
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* [[Abstract algebra]]
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* [[Elementary algebra]]
  
*Inequalities
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[[Category:Algebra]] [[Category:Mathematics]]
** [[Arithmetic Mean-Geometric Mean | Arithmetic Mean-Geometric Mean Inequality]]
 
** [[Cauchy-Schwarz Inequality]]
 
** [[Chebyshev's Inequality]]
 
** [[Geometric inequalities]]
 
** [[Hölder's Inequality]]
 
** [[Isoperimetric inequalities]]
 
** [[Jensen's Inequality]]
 
** [[Minkowski Inequality]]
 
** [[Muirhead's Inequality]]
 
** [[Power Mean Inequality]]
 
** [[Rearrangement Inequality]]
 
** [[Schur's Inequality]]
 
** [[Smoothing]]
 
** [[Triangle Inequality]]
 
** [[Trigonometric inequalities]]
 
** [[Trivial Inequality]]
 
 
 
== More Advanced Topics in Algebra ==
 
 
 
* [[Group theory]]
 
* [[Ring theory]]
 
* [[Field theory]]
 
* [[Galois theory]]
 
* [[Homological algebra]]
 
* [[Lie theory]]
 
* [[Algebraic geometry]]
 

Latest revision as of 20:18, 18 June 2021

Overview

In mathematics, algebra can denote many things. As a subject, it generally denotes the study of calculations on some set. In high school, this can the study of examining, manipulating, and solving equations, inequalities, and other mathematical expressions. Algebra revolves around the concept of the variable, an unknown quantity given a name and usually denoted by a letter or symbol. Many contest problems test one's fluency with algebraic manipulation. Algebra can be used to solve different types of equations, but algebra is also many other things Modern algebra (or "higher", or "abstract" algebra) deals (in part) with generalisations of the normal operations seen arithmetic and high school algebra. Groups, rings, fields, modules, and vector spaces are common objects of study in higher algebra. Algebra Involving Equation Algebra can be used to solve equations as simple as 3x=9 but in some cases so complex that mathematicians have not figured how to solve the particular equation yet. As if to add to the confusion, "algebra" is the name for a certain kind of structure in modern algebra.

Modern algebra also arguably contains the field of number theory, which has important applications in computer science. (It is commonly claimed that the NSA is the largest employer in the USA of mathematicians, due to the applications of number theory to cryptanalysis.) However, number theory concerns itself with a specific structure (the ring $\mathbb{Z}$), whereas algebra in general deals with general classes of structure. Furthermore, number theory interacts more specifically with certain areas of mathematics (e.g., analysis) than does algebra in general. Indeed, number theory is traditionally divided into different branches, the most prominent of which are algebraic number theory and analytic number theory.

Study Guides to Algebra

Recommended AoPS books

  • Introduction to Algebra [1]
  • Intermediate Algebra [2]

Competition math for middle school

See also