Does this theorem/collection of theorems have a name? Or is it just seen as obvious? – math.stackexchange.com

Does this theorem/collection of theorems have a name? Or is it just seen as obvious? – math.stackexchange.com

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After some thought I realized that given any sets $X$ and $Y$ with equal cardinality and an arbitrary bijection $f:X\to Y$ we get that the set of all bijections from $X$ to $Y$ is given by: $$\{f\...

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