The answers to exercise marked [BB] can he found in the Back of the Book.
(a) [BB] Prove that the composition of one-to-one functions is a one-to-one function.
(b) Show, by an example, that the converse of (a) is not true.
(c) Show that if g o ƒ is one-to-one then ƒ must be one-to-one.
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