Nuprl - Proof: exists functionality wrt iff 2

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At: exists functionality wrt iff 2

1. S : Type
2. T : Type
3. P : S

Prop
4. Q : S

Prop
5. S = T
6.

x:S. P(x)

Q(x)
7.

y:T. Q(y)

x:S. P(x)

By:	(Analyze 7 THEN Witness y) THEN HypBackchain

Generated subgoals:

None

About:

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