Nuprl - Proof: xor vs neg n dec 1 1

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At: xor vs neg n dec 1 1

1. P : Prop
2. Q : Prop
3. P XOR Q

P) & Dec(P)

By:	Analyze3 THEN UnfoldTop Def P & Q == PQ 0 THEN FoldTop Def A & B == AB 0 THEN Analyze

Generated subgoals:

1 3. P  Q
4. (P & Q)
  Q  P
3 steps

2 3. P  Q
4. (P & Q)
5. Q  P
  Dec(P)
2 steps

About:

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

1	3. P Q 4. (P & Q) Q P	3 steps
2	3. P Q 4. (P & Q) 5. Q P Dec(P)	2 steps