SOLUTION: I need a 2 column proof help https://answers.yahoo.com/question/index?qid=20200106160202AAZbtvF

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Question 1150963: I need a 2 column proof help
https://answers.yahoo.com/question/index?qid=20200106160202AAZbtvF
Answer by Edwin McCravy(20065) About Me  (Show Source):
You can put this solution on YOUR website!
You must not know that when you prove that something is NOT the case, you start by
assuming that it IS the case, and show that the assumption leads to a contradiction.