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Suppose sqrt(2) < 1 and assume that only the positive sqrt is being considered.

Then square both sides of the inequality: 2 < 1 which is a contradiction.

So the supposition is wrong ie sqrt(2) > 1

Of course, there is a sqrt of 2 which is not >1, and that is -1.4142..

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Q: Why is the square root of 2 greater than 1?
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