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本文利用一元函数微积分中乘积函数求导数的莱布尼兹公式和定积分的分部积分法,证明e是无理数。
In this paper, we use the Leibniz formula of the product function in the one-dimensional function calculus to find the derivative and the partial integration method of the definite integral, and prove that e is an irrational number.