名词
中文翻译：黎曼上积分
同义词：
['Riemann sum', 'Riemann sum of a function']
例句：
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1.The Riemann upper integral is used to estimate the value of a function at a point in the domain.
黎曼上积分用于估计函数在域内某点的值。
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2. In mathematics, the Riemann upper integral is a fundamental concept that underlies many other mathematical concepts.
在数学中，黎曼上积分是许多其他数学概念的基础。
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3. The Riemann upper integral is also used in the study of differential equations and partial differential equations.
黎曼上积分还在研究微分方程和偏微分方程中发挥作用。