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Question Number 78671 by berket last updated on 19/Jan/20
provep⇒qandnegetionofq⇒negationofp
Answered by Rio Michael last updated on 19/Jan/20
toprovethatp⇒q≡q⇒∼p1setupatruthtablepq∼p∼qp⇒q∼q⇒∼pTTFFTTTFFTFFFTTFTTFFTTTTweseethatthelastcolumnsaretheresamethusp⇒q≡∼q⇒∼p2UsingD′morganslawp⇒q≡∼(p⇐q)≡∼q⇒∼palso∼q⇒∼p≡∼(q⇐p)≡p⇒qhencetheyarecorrect
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