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1) Construct derivations that establish the following derivability claims.

a)    {~ A ⊃ ~ B, A ⊃ C, B ∨ D, D ⊃ E} ⊢ E ∨ C


b)     {~ A ⊃ B, C ⊃ ~ B, ~ (~ C & ~ A)} ⊢ A


2) Show that the following set of sentence of SL is inconsistent in SD.


a) {B ≡ (A & ~ A), ~ B ⊃ (A & ~ A)}


3) Prove the equivalent below:


P⊃ (Q ⊃ P) and (~Q ⊃ (P ⊃ (~Q V P)))

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1) Construct derivations that establish the following derivability claims. a){~ A ~ B, A C, B D, D E} E C b){~ A B, C ~ B, ~ (~ C & ~ A)} A 2) Show...
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