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2015-06-04T21:44:35+08:00

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Subsets are sets within a set.
For example, if A = {1,2,3} , B = {1,2,3,4}
This would mean A is a subset of B, it is also a proper subset.
If we had Set C = {1,2,3,4}
Set C is a subset of B but not a proper subset. An empty set is also not a proper subset.
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2015-06-04T21:46:40+08:00
If all elements of a set are also elements of the other set...
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