Mathematics, 25.03.2020 06:37, shayleithomas

When asked to prove that the difference of any irrational number and any rational number is irrational, a student began, "Suppose not. That is, suppose the difference of any irrational number and any rational number is rational." What is wrong with beginning the proof in this way?

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When asked to prove that the difference of any irrational number and any rational number is irration...