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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Devise ways to verify results, using counterexamples and indirect proof.
Devise ways to verify results, using counterexamples and informal indirect proof.
One stated that the transfusion data were flawed, but that secular trend data provided indirect proof of efficacy.
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