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Definition of Proper subset
1. Noun. (set theory) Of a set, a set that is a subset of the set but not equal to it. ¹
¹ Source: wiktionary.com
Lexicographical Neighbors of Proper Subset
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1. Noun. (set theory) Of a set, a set that is a subset of the set but not equal to it. ¹
¹ Source: wiktionary.com