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bijective_function [2014/02/08 02:46] nikolaj |
bijective_function [2014/02/08 02:47] nikolaj |
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| We also write $X$ smaller $Y$. | We also write $X$ smaller $Y$. | ||
| - | | @#EEEE55: $Y...\mathrm{countably\ infinite}\equiv \mathbb N\approx Y$ | | + | | @#EEEE55: $Y$ ... countably infinite $\equiv \mathbb N\approx Y$ | |
| ==== Parents ==== | ==== Parents ==== | ||
| === Requirements === | === Requirements === | ||
| [[Injective function]], [[Surjective function]] | [[Injective function]], [[Surjective function]] | ||
