If English then logic
Thursday, 22 December 2011
Logic and Philosophy, A. Hausman, H. Kahane, P. Tidman, Wadsworth, 11th ed., 2010, 13-1(3)
Prove that this argument is valid:
Hc ⊃ Kc
Md ⊃ Nd
Hc
• Md
c = d
∴ Kd
• Nc
Hc ......... 3 Simp.
Kc ......... 6,1 MP
Kd ......... 4,7 Id
Md ......... 3 Simp.
Nd ......... 9,2 MP
Nc ......... 10,4 Id
Kd • Nc ......... 8,11 Conj.
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