Hi,
I have four similar problems that I am not sure how to do: Given: A1 and A2 are in X, B1 and B2 are in Y f: X->Y, g - inverse of f
I have to either prove or if false find counterargument
1. f(A1 U A2) = f(A1) U f(A2)
2. f(A1 n A2) = f(A1) n f(A2)
3. g(-1)(B1 U B2) = g(B1) U g(B2)
4...