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binary_operation [2015/04/12 15:56] nikolaj |
binary_operation [2015/04/17 15:16] nikolaj |
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==== Set ==== | ==== Set ==== | ||
| @#55CCEE: context | @#55CCEE: $X$ | | | @#55CCEE: context | @#55CCEE: $X$ | | ||
- | | @#FFBB00: definiendum | @#FFBB00: $*\in$ it | | + | | @#FF9944: definition | @#FF9944: it $\equiv X\times X\to X$ | |
- | | @#55EE55: postulate | @#55EE55: $*:X\times X\to X$ | | + | |
----- | ----- | ||
- | === Elaboration === | + | === Discussion === |
- | This is a binary function with which takes elements of $X$ to an element of $X$ itself. | + | Also called "law of composition". |
+ | |||
+ | It's is a binary function with which takes elements of $X$ to an element of $X$ itself. | ||
=== Reference === | === Reference === |