An Anselmian MOA
...Anselmian MOA...John Konnor...
1) it is necessarily possible God exists
2) necessarily( if God does not exist then necessarily God does not exist)
C) necessarily God exists
Let:
G!= God exists
□(p⊃q)⊃(◇p⊃◇q) ( Theorem of K.)
Proof:
1)□◇G!
2)□(~G!⊃□G!)
3)□(~G!⊃□G!)⊃(◇~G⊃◇□~G!) ( Theorem of K.)
4)◇~G⊃◇□~G! (2,3 MP)
5)~◇□~G!⊃~◇~G (4, Contra.)
6) ~◇~◇~~G!⊃~◇~G (5 ME)
7)□◇G!⊃□G! (6 ME, DN)
8)□G! (1,7 MP)
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