Definitions from Wiktionary (proper subset)
▸ noun: (set theory) a set that is a subset of the set, but not equal to it.
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▸ noun: (set theory) a set that is a subset of the set, but not equal to it.
Similar:
set-theoretic difference,
subsethood,
relative complement,
superset,
subitemset,
subpermutation,
complement,
subset,
ordered set,
ideal,
more...
Opposite:
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▸ Wikipedia articles (New!)
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▸ Invented words related to proper subset