Category:Set of Finite Character with Countable Union is Type M

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This category contains pages concerning Set of Finite Character with Countable Union is Type M:


Let $S$ be a set of sets of finite character.

Let its union $\bigcup S$ be countable.


Then $S$ is of type $M$.

That is:

every element of $S$ is a subset of a maximal element of $S$ under the subset relation.