An Anselmian/Cartesian Argument from Perfection
...Anselmian/ Cartesian ontological argument from perfection ...John Konnor...
1) exists a y for all x if y does not exist or x can doubt the existence of y then it is possible x exceeds y in ontological perfection
C) God exists
Let:
DxE!y= x can doubt the existence of y
E!x= x has existence
Pxy= x exceeds y in ontological perfection
g=i(y)~◇(∃x)Pxy
Proof:
1)(∃y)(∀x)~E!y∨DxE!y⊃◇Pxy. P
2)(∃y)(∀x)~E!y∨DxE!y. AIP
3)~E!g∨DaE!g. 2, EI, UI
4)~E!g∨DaE!g⊃◇Pag. 1,EI,UI
5)◇Pag. 3,4 MP
6)◇(∃x)Pxg. 5 EG
7)(∃y)((~◇(∃x)Pxy∧(∀z)(~◇Pxz⊃y=z))∧◇(∃x)Pxy). 6 TD
8)((~◇(∃x)Pxb∧(∀z)(~◇Pxz⊃b=z))∧◇(∃x)Pxb)
7 EI
9)((∀z)(~◇Pxz⊃b=z)∧~◇(∃x)Pxb)∧◇(∃x)Pxb)
8 Comm.
10)(∀z)(~◇Pxz⊃b=z)∧(~◇(∃x)Pxb)∧◇(∃x)Pxb)
9 Assoc.
11)(~◇(∃x)Pxb)∧◇(∃x)Pxb). 10. Simp.
12)(∃y)(∀x)~(~E!y∨DxE!y). 2-11 IP
13) ~(~E!g∨DaE!g). 12, EI,UI
14)E!g∧~DaE!g. 13 DeM.
15)E!g. 14 Simp.
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