Noun
proper subset (plural proper subsets)
(set theory) a set that is a subset of the set, but not equal to it.
{2, 4, 5} is a proper subset of {1, 2, 3, 4, 5}, but {1, 2, 3, 4, 5} is not.
A is a subset of B Example: :* The set of all men is a proper subset of the set of all people. Source: Internet
A proper subset and the associated injection of into is characterized by a predicate expressing a strictly more restrictive property. Source: Internet
Each of the number systems mentioned above is a proper subset of the next number system. Source: Internet
If A is a subset of, but not equal to, B, then A is called a proper subset of B, written A ⊊ B (A is a proper subset of B) or B ⊋ A (B is a proper superset of A). Source: Internet
It is accepted by the pushdown automaton where is defined as follows: meaning of 's arguments and results: Unambiguous CFLs are a proper subset of all CFLs: there are inherently ambiguous CFLs. Source: Internet
Each of the above sets of numbers has an infinite number of elements, and each can be considered to be a proper subset of the sets listed below it. Source: Internet