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Asked Oct 1, 2019
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if C={}         is {} subset of C ?

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Step 1

Question: Is the empty set a subset of itself?

Step 2

Recall the notion of a subset of a set. Y is a subset of X ...

By definition,
Yc X, (Y subset of X)
yeYyeX
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By definition, Yc X, (Y subset of X) yeYyeX

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