I'm not sure how i would go about this problem....(adsbygoogle = window.adsbygoogle || []).push({});

Let f: A-> B

(which i know means.... f is a function from A to B which also means.... that A is the domain and B is the range or image)

Let A_{0}[tex]\subset[/tex]A and B_{0}[tex]\subset[/tex]B

a. show that A_{0}[tex]\subset[/tex]f^{-1}(f(A_{0})) and the equality hold if f is injective.

b. show that f^{-1}(f(B_{0})) and B_{0}and the equality hold if f is surjective

thanks

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# Injective and surjective

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