Difference between revisions of "Real number"
IntrepidMath (talk | contribs) m (Real numbers moved to Real number: Singular, is mostly references in articles as real number, is Defined as real number, etc.) |
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A '''real number''' is a number that falls on the real number line. It can have any value. Some examples of real numbers are:<math>1, 2, -23.25, 0, \frac{\pi}{\phi}</math>, and so on. Numbers that are not real are <math>3i</math>, <math>3+2.5i</math>, <math>3+2i+2j+k</math>, i.e. [[complex numbers]], and [[quaternions]]. | A '''real number''' is a number that falls on the real number line. It can have any value. Some examples of real numbers are:<math>1, 2, -23.25, 0, \frac{\pi}{\phi}</math>, and so on. Numbers that are not real are <math>3i</math>, <math>3+2.5i</math>, <math>3+2i+2j+k</math>, i.e. [[complex numbers]], and [[quaternions]]. | ||
| − | The set of real numbers is denoted by <math>\mathbb{R}</math>. | + | The set of real numbers is denoted by <math>\mathbb{R}</math>. Commonly used subsets of the real numbers are irrational numbers, rational numbers, integers, and natural numbers. |
Revision as of 11:36, 23 June 2006
A real number is a number that falls on the real number line. It can have any value. Some examples of real numbers are:
, and so on. Numbers that are not real are 
, 
, 
, i.e. complex numbers, and quaternions.
The set of real numbers is denoted by 
. Commonly used subsets of the real numbers are irrational numbers, rational numbers, integers, and natural numbers.
