real number

real number


Definition of REAL NUMBER

:  a number that has no imaginary part <the set of all real numbers comprises the rationals and the irrationals>

First Known Use of REAL NUMBER

circa 1909

real number

noun    (Concise Encyclopedia)

In mathematics, a quantity that can be expressed as a finite or infinite decimal expansion. The counting numbers, integers, rational numbers, and irrational numbers are all real numbers. Real numbers are used in measuring continuously varying quantities (e.g., size, time), in contrast to measurements that result from counting. The word real distinguishes them from the imaginary numbers.


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