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Question

1) Show that the following argument is valid in SD.~ DC ⊃ (A ≡ B)(D ∨ B) ⊃ ~ A(A ≡ B) ⊃ (D & E)

~ B ⊃ D

______________

C ⊃ (~ A & B)


2) Show that the following argument is valid in SD.

a)  ~ F

    ~ G

 ___________

 ~ (F ∨ G)

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1) Show that the following argument is valid in SD. ~ D C (A B) (D B) ~ A (A B) (D & E) ~ B D ______________ C (~ A & B) 2) Show that the following...
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