Logic For Dummies
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In any logic system, you compare statements to prove or disprove their validity. With sentential logic, you use the following equivalence rules to make those comparisons:

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Mark Zegarelli is a professional writer with degrees in both English and Math from Rutgers University. He has earned his living for many years writing vast quantities of logic puzzles, a hefty chunk of software documentation, and the occasional book or film review. Along the way, he’s also paid a few bills doing housecleaning, decorative painting, and (for ten hours) retail sales. He likes writing best, though.

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