Computable real number
A real number for which there exists an algorithm which yields a rational approximation to the number, as accurate as one pleases. The term "constructive real number" has a similar meaning, and is usually employed when a computable real number is considered in the framework of some system of constructive mathematics (see Constructive analysis).
Computable real number. B.A. Kushner (originator), Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Computable_real_number&oldid=13549