indirect proof


noun

an argument for a proposition that shows its negation to be incompatible with a previously accepted or established premise.

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ELEMENTARY SCHOOL PUNCTUATION QUIZ

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British Dictionary definitions for indirect proof

indirect proof

noun

logic maths proof of a conclusion by showing its negation to be self-contradictory; reductio ad absurdumCompare direct (def. 17)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012