
1. (10 marks) Let f : X ? Y and g : Y ? X be functions such that go f = Ix. Prove or give a counterexample for each of the following statements (a) f is one-to-one (b) f is onto (c)
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1. (10 marks) Let f : X ? Y and g : Y ? X be functions such that go f = Ix. Prove or give a counterexample for each of the following statements (a) f is one-to-one (b) f is onto (c)
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