Thursday, 2 January 2020

set theory - For every infinite S, |S|=|StimesS| implies the Axiom of choice

How to prove the following conclusion:



[For any infinite set S,there exists a bijection f:SS×S] implies the Axiom of choice.



Can you give a proof without the theory of ordinal numbers.

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real analysis - How to find limhrightarrow0fracsin(ha)h

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