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proper subset

 

Definitions from the Web

Proper subset

Description:

A proper subset is a mathematical term that defines a subset, where all elements of one set are contained within another set, but the sets are not equal. In other words, a proper subset is a subset that is strictly smaller than the original set.

Sample sentences:

  1. "In set theory, if A = {1, 2, 3} and B = {1, 2, 3, 4}, then A is a proper subset of B."
  2. "The set of prime numbers is a proper subset of the set of natural numbers."
  3. "Sheila's collection of novels is a proper subset of the entire library."

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