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1. a) Let f : C → D be a function. Prove that if C1 and...

1. a) Let f : C → D be a function. Prove that if C1 and C2 be two subsets of C, then
f(C1ꓴC2) = f(C1) ꓴ f(C2).


b) Let f : C → D be a function. Let C1 and C2 be subsets of C. Give an example of
sets C, C1, C2 and D for which f(C ꓵ D) ≠ f(C1) ꓵ f(C2).

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