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by contradiction

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数学 от противного (доказательство • To prove something by contradiction, we assume that what we want to prove is not true, and then show that the consequences of this are not possible. That is, the consequences contradict either what we have just assumed, or something we already know to be true (or, indeed, both) – we call this a contradiction. maths.org); от противного (proof by contradiction – доказательство от противного)
proof by contradiction
数学 доказательство от противного
by contradiction
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