element of Y ∪ Z operation on sets
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element of Y ∪ Z operation on sets
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Answer:
et X is asubset of set Y iffe∈X impliese∈Y for everye. We write this as X⊆Y. ⊆ is an order relation. Sets X andY areequal iffthey have exactly the same elements. Equivalently, X and Y are equal iffX⊆Y andY⊆X.
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