Can you provide an example of solving a proof in Predicate Logic?
- ∃x(Gx • Px) ∨ ∃x(Sx • Ex).
- ∼∃x(Ex) ∴∃x(Px)
Michael A.
answered 04/21/19
Philosophy! Ethics, Logic, History, Composition of papers, etc.
3.)∀x∼Ex 2, QN
4.)∼ Ei 3, EI
5.)~Ei ∨ ~Si 4, add
6.)~Si ∨ ~Ei 5, comm
7.)~(Si • Ei) 6, DeM
8.)∀x~(Sx • Ex) 7, UG
9.)~∃x(Sx • Ex) 8, QN
10.)∃x(Gx • Px) 1,9 DS
11.)Gj • Pj 10, EI
12.)Pj 11, Simp
13.)∃x(Px) 12, EG
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