SOLUTION: Prove ((B union{x})-{x}) is a subset of B.

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Question 409468: Prove ((B union{x})-{x}) is a subset of B.
Answer by solver91311(24713) About Me  (Show Source):
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If then and then and then contains all the elements of except . Then is a proper subset of B, and is therefore a subset of B by definition of subset.

If then . But any set is a subset of itself by definition of subset, therefore .



John

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