Integral upper limit function is a basic concept in function differential calculus.
积分上限函数是一元函数微分学的基本概念。
The integral upper limit function strengthened between the differential and the integral relation, is the definite integral fundamental formula rationale.
积分上限函数加强了微分和积分之间的联系，是定积分基本公式的理论基础。
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