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Exercise 1.4 · Q115

Q.Without using truth table, prove that: ∼[(p∨∼q)→(p∧∼q)]≡(p∨∼q)∧(∼p∨q)\sim [(p \vee \sim q) \to (p \wedge \sim q)] \equiv (p \vee \sim q) \wedge (\sim p \vee q)

Maharashtra MsbshseTextbookSubjectiveImportance★★★★★
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∼[(p∨∼q)→(p∧∼q)]≡∼[∼(p∨∼q)∨(p∧∼q)]\sim[(p\vee\sim q)\to(p\wedge\sim q)] \equiv \sim[\sim(p\vee\sim q)\vee(p\wedge\sim q)] [Conditional law: a→b≡∼a∨ba\to b\equiv \sim a\vee b]

≡∼[∼(p∨∼q)]∧∼(p∧∼q)\equiv \sim[\sim(p\vee\sim q)]\wedge\sim(p\wedge\sim q) [De Morgan's law]

≡(p∨∼q)∧∼(p∧∼q)\equiv (p\vee\sim q)\wedge\sim(p\wedge\sim q) [Double negation] …

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