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idempotent_function [2014/02/08 18:34] nikolaj |
idempotent_function [2014/02/08 18:35] nikolaj |
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===== Idempotent function ===== | ===== Idempotent function ===== | ||
==== Set ==== | ==== Set ==== | ||
- | | @#88DDEE: $X,Y$ ... set | | + | | @#88DDEE: $X$ ... set | |
- | | @#FFBB00: $ f\in \mathrm{it}(X,X) $ | | + | | @#FFBB00: $ f\in \mathrm{it}(X) $ | |
- | | @#55EE55: $ f:X\to Y $ | | + | | @#55EE55: $ f:X\to X $ | |
| @#55EE55: $ f\circ f=f $ | | | @#55EE55: $ f\circ f=f $ | | ||