The range of the signum function defined for all real is

MATHEMATICS · Single correct · AoPS · Mathematics · Special Functions · Special Functions

Problem

The range of the signum function sgn⁡(x)\operatorname{sgn}(x) defined for all real xx is (a) [−1,1][-1,1] (b) {−1,0,1}\{-1,0,1\} (c) {−1,1}\{-1,1\} (d) [0,∞)[0,\infty)

Related theory

Browse the problem library