Nuprl - Pf decidable functionality wrt iff 2 2 1

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At: decidable functionality wrt iff 2 2 1

1. P: Prop
2. Q: Prop
3. P Q
4. P Q
5. Q

P

By: Unfold `not` 0 THEN Unfold `not` 5

Generated subgoal:

1 5. Q False
6. P
False

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