indirect proof

an argument for a proposition that shows its negation to be incompatible with a previously accepted or established premise. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
indirect proof
logic, maths Compare direct proof of a conclusion by showing its negation to be self-contradictory; reductio ad absurdum

Collins English Dictionary - Complete & Unabridged 10th Edition
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