Question
Prove that the following arguments are standard by constructing metaphorical proof
(P$\rightarrow$Q) & (R v S)
(R v S) $\rightarrow$ ~ L
L v (M & N)
$\therefore$ [(P $\rightarrow$ Q) & M] & ~ L

Answer

(1)(P$\rightarrow$Q) & (R v S) P
(2) (R v S)$\rightarrow$~ L P
(3) L v (M & N) P/$\therefore$ [(P$\rightarrow$Q) & M] & ~L
(4) P$\rightarrow$Q 1, Simp.
(5) R v S 1, Simp.
(6) ~ L 2, 5, MP
(7) M & N 3, 6, DS
(8) M 7, Simp.
(9)(P$\rightarrow$Q) & M 4, 8, Conj.
(10) (P$\rightarrow$Q) & M] & ~L 9, 6, Conj.

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