Friday, 11 December 2020

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

 

1.     (x)(Lx ⊃ x = e)

2.     (x)(Sx ⊃ x = i)

3.     (∃x)(Lx • Sx)

∴ i = e

4.     Lm • Sm

5.     Lm ⊃ m = e

6.     Sm ⊃ m = i

7.     Lm

8.     m = e

9.     Sm • Lm

10. Sm

11. m = i

12. i = m

13. i = e

 

 

 

 

3 EI

1 UI

2 UI

4 Simp

5,7 MP

4 Com

9 Simp

6,10 MP

11 Com

8,12 Id

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