Thursday, December 8, 2016

functions - Images and preimages of sets

This is probably very basic indeed, but I've just ran into a proof that seems to imply that letting f:XY, CX and PY, QY,



f(C)=PQC=f1(PQ),



which I can only understand to be true if f is bijective. Am I having a mental blackout?



Thanks,



Miguel

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