Nuprl - Proof: choose elim neg 1 2

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At: choose elim neg 1 2

1. 'a : S
2. P : 'a

Prop
3. Q : 'a

Prop
4.

x:'a. Q(x)

P(x)
5. (

x:'a.

Q(x))

(

x:'a. P(x))
6. {x:'a| Q(x) }

Void

P(arb('a))

By:	BackThru 5 THEN StrongAuto

Generated subgoal:

1 7. x : 'a
Q(x)
3 steps

About:

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