Modern (Abstract) Algebra
posted by dreww1961 .
Let f:A>B, where A and B are nonempty
Prove that f(S1  f(S2) is a proper subset of f(S1 S2) fo all subsets S1 and S2 of A.
Give an example where there are subsets S1 and S2 of A such that
f(S1)  f(S2) does not equal f(S1S2)
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