Difference between revisions of "Irrational number"
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| − | + | An '''irrational number''' is a [[real number]] that cannot be expressed as the ratio of two [[integers]]. | |
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| + | Irrational numbers often arise as solutions to problems involving rational numbers. For example, the square root of 2 is irrational. Other irrationals, such as [[pi]], serve as fundamental constants in many mathematical problems. | ||
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| + | Irrational numbers can never be expressed exactly using decimal notation with a finite number of digits. Instead it is common to write them using only enough significant digits to solve the problem at hand, followed by an ellipsis (…): | ||
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| + | :<math>\pi\ = 3.1415926...</math> | ||
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| + | ==See also== | ||
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| + | [[Transcendental numbers]] | ||
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| + | [[Category:mathematics]] | ||
Revision as of 14:36, June 22, 2010
An irrational number is a real number that cannot be expressed as the ratio of two integers.
Irrational numbers often arise as solutions to problems involving rational numbers. For example, the square root of 2 is irrational. Other irrationals, such as pi, serve as fundamental constants in many mathematical problems.
Irrational numbers can never be expressed exactly using decimal notation with a finite number of digits. Instead it is common to write them using only enough significant digits to solve the problem at hand, followed by an ellipsis (…):
- <math>\pi\ = 3.1415926...</math>