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countable_union [2013/09/14 16:50] nikolaj |
countable_union [2014/03/21 11:11] (current) |
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| ===== Countable union ===== | ===== Countable union ===== | ||
| - | ==== Definition ==== | + | ==== Set ==== |
| - | | @#88DDEE: $A\in \mathrm{Sequence}(X) $ | | + | | @#55CCEE: context | @#55CCEE: $A\in \mathrm{Sequence}(X) $ | |
| - | | @#88DDEE: $n\in \mathbb N\cup\{\infty\}$ | | + | | @#55CCEE: context | @#55CCEE: $n\in \mathbb N\cup\{\infty\}$ | |
| - | | @#FFBB00: $\bigcup_{j=1}^n A_j \equiv \bigcup A(\mathrm{range}(n))$ | | + | | @#FFBB00: definiendum | @#FFBB00: $\bigcup_{j=1}^n A_j \equiv \bigcup A(\mathrm{range}(n))$ | |
| ==== Discussion ==== | ==== Discussion ==== | ||
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| === Refinement of === | === Refinement of === | ||
| [[Indexed union]] | [[Indexed union]] | ||
| - | === Requirements === | + | === Context === |
| [[Sequence]] | [[Sequence]] | ||
