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Question: exercise 11 given two finite nonempty sets a b under...

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Exercise 1.1 Given two finite, non-empty sets A, B, under what conditions on the cardinalities IAI. IBl is the set of injective maps f : A → B non- empty? Provided this condition is satisfied, how many injective maps are there? When are the resulting maps bijections? Briefly () explain your reasoning for each part of the question.
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