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OpenStudy (anonymous):
Is it possible to find a function f(x) such that f(f^-1(B)) does NOT equal B? where in f:X-->Y, B is a subset of Y?
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OpenStudy (yuki):
intuitively that should never happen ... because f^-1: Y -->X
OpenStudy (yuki):
and f(x) is defined for all x in X
OpenStudy (yuki):
maybe you can do a proof by contradiction?
OpenStudy (yuki):
maybe you can do a proof by contradiction?
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