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involution [2014/02/08 18:35] nikolaj old revision restored (2014/02/08 18:34) |
involution [2015/03/29 19:08] nikolaj |
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| ===== Involution ===== | ===== Involution ===== | ||
| ==== Set ==== | ==== Set ==== | ||
| - | | @#88DDEE: $X$ ... set | | + | | @#55CCEE: context | @#55CCEE: $X$ ... set | |
| + | | @#FFBB00: definiendum | @#FFBB00: $ f\in \mathrm{it}(X,X) $ | | ||
| + | | @#55EE55: postulate | @#55EE55: $ f:X\to X $ | | ||
| + | | @#55EE55: postulate | @#55EE55: $ f\circ f=\mathrm{id_X} $ | | ||
| - | | @#FFBB00: $ f\in \mathrm{it}(X,X) $ | | + | ----- |
| - | + | ----- | |
| - | | @#55EE55: $ f:X\to X $ | | + | |
| - | | @#55EE55: $ f\circ f=\mathrm{id_X} $ | | + | |
| - | + | ||
| - | ==== Discussion ==== | + | |
| - | ==== Parents ==== | + | |
| === Subset of === | === Subset of === | ||
| [[Unary operation]] | [[Unary operation]] | ||
