Thursday, 19 November 2020

A Concise Introduction to Logic, Patrick J. Hurley, Wadsworth, 2006, 9th ed,. 8.7, II, 5, p. 447

 

1.     (x)(Gx ⊃ x = a)

2.     (∃x)(Gx • Hx)

∴ Ha

3.     Gm • Hm

4.     Gm ⊃ m = a

5.     Gm

6.     m = a

7.     Hm • Gm

8.     Hm

9.     Ha

 

 

 

2 EI

1 UI

3 Simp

4,5 MP

3 Com

7 Simp

6,8 Id

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