Assume a statement true and then show it must be false
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The term that best describes a proof in which you assume the opposite of what you want to prove is 'indirect proof'.
Contradiction or indirect proof.
An indirect proof is a proof by contradiction.
An indirect proof is another name for a proof by contradiction. This is where the original premise is assumed to be false and then attempted to be proven. Because this proof turns out to be false, the original premise is then true.
TrueIt is true that the body of an indirect proof you must show that the assumption leads to a contradiction. In math a proof is a deductive argument for a mathematical statement.