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irrational number
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irrational number

Number that cannot be expressed as an exact fraction. Irrational numbers include some square roots (for example, √2, √3, and √5 are irrational); numbers such as π (for circles), which is approximately equal to the decimal 3.14159; and e (the base of natural logarithms, approximately 2.71828). If an irrational number is expressed as a decimal it would go on for ever without repeating. An irrational number multiplied by itself gives a rational number.



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? Mentioned in ? References in periodicals archive
 
For example, the Pythagoreans did not expect to uncover irrational numbers in the diagonal of a square.
Explore math with Theoni Pappas by Science News
This remarkable equation involves two irrational numbers, s and e; the symbol of nothing, 0; the unit imaginary number i; and of course the whole sequence of negative numbers based on (-1).
To the editors. (Correspondence) by Commonweal
For example, the Pythagoreans did not expect to uncover irrational numbers in the diagonal of a square.
Explore math with Theoni Pappas by Science News
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