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Countable union
Definition
$X$
$A\in \mathrm{Sequence}(X)\ \lor\ A\in\mathrm{FinSequence}(X)$
$n\in \mathbb N\cup\{\infty\}$
$\bigcup_{j=1}^n A_j \equiv \bigcup A(\mathrm{range}(n))$
Discussion
Parents
Refinement of
Arbitrary union
Requirements
Sequence
,
Finite sequence
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