Some people may ask, when Pythagorean school first tried to confirm whether √2 was a rational number, they didn't know that √2 was not a rational number. In this case, could you ask: Can √2 be written in the form of simplest fraction? The author's answer is: this question is unreasonable. The reason is that since the arguer still doesn't know whether √2 is a rational number, how can we guarantee that this question will not be a complicated question?
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