December 22, 2014

Homework Help: math

Posted by gemma on Sunday, April 14, 2013 at 8:41pm.

Given: f(closure(A)) subset of closure(f(A))
Prove: For any closed set A in Y, f^-1(A) is closed in X (AKA f is continuous)

X and Y are metric spaces
f: X -> Y
f^-1 is f inverse.
closure(A) = A U limit points of A

The first line is Let C be a closed subset of Y. Then we have to show that f^-1(C) is closed in X.
I have made several attempts but nothing is working. Anyone have any ideas?
30 minutes ago - 4 days left to answer.

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