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5:53
YouTube
Wrath of Math
Proof: A is a Subset of B iff A Union B Equals B | Set Theory, Subsets
A is a subset of B if and only if A union B equals B. We'll be sharpening our set theory proof skills with this simple result in today's video set theory lesson! Think of the result like this, if A is contained in B, then adding the elements of A to B doesn't change B at all, because B already contains the elements of A, and so their union is ...
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