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Vanilla 1.1.10 is a product of Lussumo. More Information: Documentation, Community Support.
created for completeness: cofinite subset, cofinite topology
I have added the definition of a cofinite subset of a (pre)ordered set.
A preordered set $(\Lambda,\leq)$ is cofinite or closure finite if for every $\lambda\in\Lambda$ the set of all predecessors of $\lambda$ is finite.
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