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11 Aug 2018
5. Let f: A + B be a function. (a) Prove that for any two sets C, DCA, we have f( C D) SfCn f(D). (b) Give an example of a function f, and sets C, D, for which f(COD) + f(C)nf(D)
5. Let f: A + B be a function. (a) Prove that for any two sets C, DCA, we have f( C D) SfCn f(D). (b) Give an example of a function f, and sets C, D, for which f(COD) + f(C)nf(D)
Casey DurganLv2
13 Aug 2018
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