Use conditional proof or indirect proof and the eighteen rules of inference to establish the truth of
Question:
Use conditional proof or indirect proof and the eighteen rules of inference to establish the truth of the following tautologies.
![~[(P~P) (~PP)]](https://dsd5zvtm8ll6.cloudfront.net/si.question.images/images/question_images/1696/2/4/9/565651ab6dd8d7681696249565236.jpg){kind=small}
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Step by Step Answer:
To establish the truth of the tautology P P P P you can use a conditional proof Heres the proof step ...View the full answer
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Related Book For 
A Concise Introduction to Logic
ISBN: 978-1305958098
13th edition
Authors: Patrick J. Hurley, Lori Watson
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