Question: The replacement rule (a = -b): - (a Klenk's system, is a truth-preserving rule. Explain why. b), though not part of

The replacement rule (a = -b): - (a Klenk's system, is a 

The replacement rule (a = -b): - (a Klenk's system, is a truth-preserving rule. Explain why. b), though not part of

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