Mathematics, 25.05.2021 20:40 velazquez2974
1) Prove that if A⊨tautB and C⊨tautD then A∨C⊨tautB∨D . 2) Show that the formulae A≡⊥ and ¬A are tautologically equivalent.
Answers: 1
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1) Prove that if A⊨tautB and C⊨tautD then A∨C⊨tautB∨D .
2) Show that the formulae A≡⊥ and ¬A are ta...
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