Nuprl - Pf decidable functionality wrt iff 1 2 1

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At: decidable functionality wrt iff 1 2 1

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

Q

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

Generated subgoal:

1 5. P False
6. Q
False

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