User:Dfeuer/Definition:Class
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Definition
Let $\mathbb U$ be the universal class.
Let $S$ be a collection.
Then $S$ is a class iff $S \subseteq \mathbb U$
Let $\mathbb U$ be the universal class.
Let $S$ be a collection.
Then $S$ is a class iff $S \subseteq \mathbb U$