Question

Prove the following:

Suppose thatX is a tidy set. Then for any sets a and b, if a ∈ b and b ∈ X, then a ∈ X.

Prove the following:
Suppose that X is a tidy set. Then for any sets a and b, if a e b and b E X, then a E X

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Prove the following: Suppose that X is a tidy set. Then for any sets a and b, if a e b and b E X, then a E X

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