Mathematics, 26.05.2021 01:00 JahtreseStringfelow

(a) We must prove the following expression that if A |=taut B and C |=taut D then A ∨ C |=taut B ∨ D. (b) Show that the formulas A ≡ ⊥ and ¬A are tautologically equivalent?

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(a) We must prove the following expression that if A |=taut B and C |=taut D then A ∨ C |=taut B ∨ D...

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