Q: What does proper set mean?

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No. The null set cannot have a proper subset. For any other set, the null set will be a proper subset. There will also be other proper subsets.

A set with only one element in it. The only proper subset of such a set is the null set.

The empty set.

It is a set that is well defined.

NO

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There is no such concept as "proper set". Perhaps you mean "proper subset"; a set "A" is a "proper subset" of another set "B" if:It is a subset (every element of set A is also in set B)The sets are not equal, i.e., there are elements of set B that are not elements of set A.

An empty set is not a proper subset of an empty set.An empty set is not a proper subset of an empty set.An empty set is not a proper subset of an empty set.An empty set is not a proper subset of an empty set.

proper set is a common that we ask

NO- by definition a set is not a proper subset of itself . ( It is a subset, but not a proper one. )

No. The null set cannot have a proper subset. For any other set, the null set will be a proper subset. There will also be other proper subsets.

It isn't. The empty set is a subset - but not a proper subset - of the empty set.

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.

A set with only one element in it. The only proper subset of such a set is the null set.

The empty set.

The null set is a proper subset of any non-empty set.

The set {1, 3} is a proper subset of {1, 2, 3}.The set {a, b, c, d, e} is a proper subset of the set that contains all the letters in the alphabet.All subsets of a given set are proper subsets, except for the set itself. (Every set is a subset of itself, but not a proper subset.) The empty set is a proper subset of any non-empty set.This sounds like a school question. To answer it, first make up any set you like. Then, as examples of proper subsets, make sets that contain some, but not all, of the members of your original set.

The set of proper factors doesn't include 1 and the number itself.