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Question: 8 pnan dq also written plg and called the sheffer...

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8. pNAN Dq, also written plg and called the Sheffer stroke, is false only when both p and q are true (a) Show that plq Ξ-(png). (b) Express pA q using only the Sheffer stroke and the propositional symbols p and q. (c) Express -p using only the Sheffer stroke and the propositional symbol p. (d) Construct a valid argument that all of propositional logic can be expressed using only the Sheffer stroke and propositional symbols.

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