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injective_function [2013/12/21 19:57] 127.0.0.1 external edit |
injective_function [2014/02/08 02:42] nikolaj |
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| ==== Discussion ==== | ==== Discussion ==== | ||
| === Predicates === | === Predicates === | ||
| - | | @#EEEE55: $Y...\mathrm{countable}\equiv \mathrm{Injective}(\mathbb N,Y)\ne\emptyset$ | | + | | @#EEEE55: $Y$ ...countably infinite $\equiv (\mathrm{Injective}(\mathbb N,Y)\ne\emptyset) $ | |
| + | | @#EEEE55: $Y$ ... countable $\equiv$ ($Y$ ...finite) $\lor$ ($Y$ ...countably infinite) | | ||
| ==== Parents ==== | ==== Parents ==== | ||
| === Requirements === | === Requirements === | ||
| [[Function]] | [[Function]] | ||
