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Q: What does proper subset means?

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the difference between a subset and a proper subset

Because every set is a subset of itself. A proper subset cannot, however, be a proper subset of itself.

Since ASCII ⊊ unicode, I don't know if there are ASCII codes for subset and proper subset. There are Unicode characters for subset and proper subset though: Subset: ⊂, &sub;, &#8834; Subset (or equal): ⊆, &sube;, &#8838; Proper subset: ⊊, &#8842;,

A subset of a set S can be S itself. A proper subset cannot.

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.

yes

Proper subset definitionA proper subset of a set A is a subset of A that is not equal to A. In other words, if B is a proper subset of A, then all elements of B are in Abut A contains at least one element that is not in B.For example, if A={1,3,5} then B={1,5} is a proper subset of A. The set C={1,3,5} is a subset of A, but it is not a proper subset of A since C=A. The set D={1,4} is not even a subset of A, since 4 is not an element of A.

give example of subset

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.

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

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