inverse
<mathematics> Given a function, f : D -> C, a function g : C -> D is
called a left inverse for f if for all d in D, g (f d) = d and a right inverse
if, for all c in C, f (g c) = c and an inverse if both conditions hold. Only an
injection has a left inverse, only a surjection has a right inverse and only a
bijection has inverses. The inverse of f is often written as f with a -1
superscript.
(1996-03-12)
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