# Real function

From Encyclopedia of Mathematics

A function for which both the set of definition and the set of values are subsets of the set of real numbers.

#### Comments

So, a real function is understood to be a real-valued function on a subset of the real numbers. In the Western literature, "real" most often simply means "real-valued" .

**How to Cite This Entry:**

Real function. L.D. Kudryavtsev (originator),

*Encyclopedia of Mathematics.*URL: http://www.encyclopediaofmath.org/index.php?title=Real_function&oldid=17448

This text originally appeared in Encyclopedia of Mathematics - ISBN 1402006098