Question1: (a) Show using the proof system that the sentence ¬(Ca ∧ ¬Ca) is a tautology. (b)Show using the proof system

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answerhappygod
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Question1: (a) Show using the proof system that the sentence ¬(Ca ∧ ¬Ca) is a tautology. (b)Show using the proof system

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Question1:
(a) Show using the proof system that the sentence ¬(Ca ∧ ¬Ca) isa tautology.
(b)Show using the proof system that the sentences (Qa ∧ Ca) and¬(¬Qa ∨ ¬Ca) are tautologically equivalent.
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