A B X (3x) (x) 3 CQ MP Dist 1 2 3 UI MT DN UG EI HS DS Trans Impl PREMISE (x)Bx DV = PREMISE (3x)~Ax V (3x)~Bx PREMISE EG III Id CD Equiv CONCLUSION ~(x) Ax = th Simp Exp ( ) Conj Taut Add ACP DM CP [ ] Com AIP Assoc IP

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A: If you have any questions let me know in comment box thankyou for your question.

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Q: how to prove that contrapositive of the contrapositive is the original statement?

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