Nuprl - Proof: exteq sigma st dom 1

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At: exteq sigma st dom 1

1. A : Type
2. B : A

Type
3. P : A

Prop

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

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

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

By:	Analyze THEN New:z Analyze

Generated subgoals:

1 4. z : i:{i:A| P(i) }B(i)
z {v:(i:AB(i))| P(v/x,y. x) }
2 steps

2 4. z : {v:(i:AB(i))| P(v/x,y. x) }
z i:{i:A| P(i) }B(i)
4 steps

About:

IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html

1	4. z : i:{i:A\| P(i) }B(i) z {v:(i:AB(i))\| P(v/x,y. x) }	2 steps
2	4. z : {v:(i:AB(i))\| P(v/x,y. x) } z i:{i:A\| P(i) }B(i)	4 steps