Mathematics, 27.03.2020 05:56 lacilebeck69641
1. Prove or give a counterexample for the following statements: a) If ff: AA → BB is an injective function and bb ∈ BB, then |ff−1({bb})| = 1. b) If ff: AA → BB is a bijection and AA is countable, then BB is countable. c) If ff: AA → BB is a surjective function and AA is finite, then BB is finite. d) If ff: AA → BB is a surjective function and BB is finite, then AA is finite.
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1. Prove or give a counterexample for the following statements: a) If ff: AA → BB is an injective fu...
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