Invertible
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(新頁面: A function f:A->B is said to be invertible if there exists a function g:b->A such that f(g(y)) = y for all y belong to B and g(f(x) = x for all x belong to A. f is invertible if a...)
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在2008年1月9日 (三) 11:39所做的修訂版本
A function f:A->B is said to be invertible if there exists a function g:b->A such that
f(g(y)) = y for all y belong to B and g(f(x) = x for all x belong to A.
f is invertible if and only if f is both one-to-one and onto.
