Unformatted text preview: f ◦ g = I B . Give an example of nonempty sets A and B and functions f : A → B and g : B → A such 3. that g ◦ f = I A but f ◦ g 6 = I B . [Hint: The ﬁrst two problems seriously restrict the possible choices for f and g .]...
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 Spring '08
 ctw
 Math, Sets, Following

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