Question 1
Consider this proof, (1.) E ⊃ (I ∙ ~ E) (2.)E /∴ ~E (3.) I ∙ ~E (4.) ~E ∙ I (5.) ~E What is the justification for line 5?
◦ 4 Simp
◦ 1, 4 MT
◦ 2 Add
Question 2
Consider this proof, (1.) I ⊃ (E ∙ ~ L) (2.) I ∙ ~D /∴ (I ∙ ~ D) ∙ ~L (3.) I (4.) E ∙ ~L (5.) ~L (6.) (I ∙ ~ D) ∙ ~L What is the justification for line 4?
◦ 1, 3 MP
◦ 2, 3 MP
◦ 1, 2, 3 MP