Integral that upperlimitofintegral is variable is a important theory, results of operation is function forma after all.
变上限积分是积分学的一个重要理论，其运算结果仍以函数的形式体现。
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Integral that upperlimitofintegral is variable is a important theory, results of operation is function forma after all. Research this kind of function, get a few theorem.
Following a detailed mathematical derivation a new approximate algorithm for the fatigue fracture of metals is given namely a complicate integral having a changing upperlimit.