Translate and derive the conclusion.
If anything is missing, then some person stole it. If anything is damaged, then some person broke it. Something is either missing or damaged. Therefore, some person either stole something or broke something. (Mx: x is missing; Px: x is a person; Sxy: x stole y; Dx: x is damaged; Bxy: x broke y)
1. (x)[Mx ⊃ (∃y)(Py • Syx)] 2. (x)[Dx ⊃ (∃y)(Py • Byx)] 3. (∃x)(Mx v Dx) ∴ (∃y)[Py • (∃x)(Syx v Byx)] 4. Mm v Dm 5. Mm ⊃ (∃y)(Py • Sym) 6. Dm ⊃ (∃y)(Py • Bym) 7. [Mm ⊃ (∃y)(Py • Sym)] • [Dm ⊃ (∃y)(Py • Bym)] 8. (∃y)(Py • Sym) v (∃y)(Py • Bym)
32. ~ ~ (∃y)[Py • (∃x)(Syx v Byx)] 33. (∃y)[Py • (∃x)(Syx v Byx)] |
3 EI 1 UI 2 UI 5,6 Conj 4,7 CD AIP 9 CQ ACP 10 UI 11,12 MP 13 UI 14 Simp 11-15 CP 16 UG 17 CQ 5,18 MT 4,19 DS 6,20 MP 21 EI 10 UI 22 Simp 23.24 MP 25 UI 26 Com 27 Simp 22 Com 29 Simp 28,30 Conj 9-31 IP 32 DN |
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