Nuprl - Proof: exteq sigma st dom

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At: exteq sigma st dom

A:Type, B:(A

Type), P:(A

Prop).

(i:{i:A| P(i) }

B(i)) =ext {v:(i:A

B(i))| P(v/x,y. x) }

By:

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Generated subgoal:

1 1. A : Type
2. B : AType
3. P : AProp
(i:{i:A| P(i) }B(i)) =ext {v:(i:AB(i))| P(v/x,y. x) }
7 steps

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