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proper subset (Definition)

Let $ S$ be a set and let $ X \subset S$ be a subset. We say $ X$ is a proper subset of $ S$ if $ X \neq S$.



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Cross-references: subset
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This is version 2 of proper subset, born on 2001-10-25, modified 2004-01-09.
Object id is 501, canonical name is ProperSubset.
Accessed 5801 times total.

Classification:
AMS MSC03E20 (Mathematical logic and foundations :: Set theory :: Other classical set theory )

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