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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World English Dictionary
indirect proof
 
n
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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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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