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OpenStudy (anonymous):
assume that you have a function from set A to set B. If u know that the functions are simultaneusly one to one(injective) and onto (surjective) what can you say about the number of elements in set A and set B
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OpenStudy (helder_edwin):
u have one function \(f:A\to B\) that is both injective and surjective, right?
OpenStudy (anonymous):
yes
OpenStudy (helder_edwin):
then both sets have the same number of elements
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