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When a set is said to be proper?

Updated: 10/17/2024
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12y ago

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A set is not, in itself, proper. However, it is a proper subset of another set if

  • every element in the first set is an element of the second set, and
  • there is at least one element in the second set which is not in the first.

In other words, all of the first set is included in the second but is not equal to the second.

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Q: When a set is said to be proper?
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A set "A" is said to be a subset of of set "B", if every element in set "A" is also an element of set "B". If "A" is a subset of "B" and the sets are not equal, "A" is said to be a proper subset of "B". For example: the set of natural numbers is a subset of itself. The set of square numbers is a subset (and also a proper subset) of the set of natural numbers.


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What is proper set?

proper set is a common that we ask


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yes, if the set being described is empty, we can talk about proper and improper subsets. there are no proper subsets of the empty set. the only subset of the empty set is the empty set itself. to be a proper subset, the subset must be strictly contained. so the empty set is an improper subset of itself, but it is a proper subset of every other set.


Which set possesses only one proper subset?

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