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- Ax(P(x)->-Q(x)) |- -(Ex(P(x) & Q(x))
- 1. AxP(x)->-Q(x)) Prem.
- 2. Ex(P(x) & Q(x)) Assum.
- 3. x0
- 4. P(x0)->-Q(x0) Ae 1
- 5. P(x0) &e1 2
- 6. Q(x0) &e2 2
- 7. -Q(x0) ->e 5,4
- 8. BOTTOM -e 6,7
- 9. -(P(x0)->-Q(x0)) PBC 4-8
- 10. -AxP(x)->-Q(x) Ai 3-9
- 11. BOTTOM -e 1,10
- 12. -Ex(P(x) & Q(x)) PBC 2-11
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