4. Answer the following questions, and give a brief explanation (one or two sentences should be...

  

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4. Answer the following questions, and give a brief explanation (one or two sentences should be enough) to justify your answer. (You do not need to write a proof.) (a) Is the following argument valid? P+Q QAP QA-P (b) Is it possible to have an valid argument where the conclusion is a contradiction? (c) Is it possible for a contradiction to be equivalent to another formula? 4. Answer the following questions, and give a brief explanation (one or two sentences should be enough) to justify your answer. (You do not need to write a proof.) (a) Is the following argument valid? P+Q QAP QA-P (b) Is it possible to have an valid argument where the conclusion is a contradiction? (c) Is it possible for a contradiction to be equivalent to another formula?

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a No the argument is not valid Validity in propositional logic requires that if th... View the full answer