CATIA UMNO. (Hint on this problem: Use arrow diagrams for ideas.) a) Find a specific example of a function f: N→→ N which is one-to-one but not onto. b) Find a specific example of a function f: Z→ Z which is one-to-one but not onto. c) Find a specific example of a function f: N→ N which is onto but not one-to-one. d) Find a specific example of a function f: Z→ Z which is onto but not one-to-one.

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