Reductio ad absurdum
Argument that leads to a logical absurdity / From Wikipedia, the free encyclopedia
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In logic, reductio ad absurdum (Latin for "reduction to absurdity"), also known as argumentum ad absurdum (Latin for "argument to absurdity") or apagogical arguments, is the form of argument that attempts to establish a claim by showing that the opposite scenario would lead to absurdity or contradiction.[1][2][3][4]
This argument form traces back to Ancient Greek philosophy and has been used throughout history in both formal mathematical and philosophical reasoning, as well as in debate. The equivalent formal rule is known as negation introduction. A related mathematical proof technique is called proof by contradiction.