Riemann integral
An abandoned child, left by its parent(s), often a baby left at a convent or similar safe place.
The area of the Solar System that comprises certain objects that are relatively close to the Sun, including Mercury, Venus, Earth and Mars, while not including the other planets.
(mathematical analysis) A type of integral whose computation involves dividing the interval of integration into smaller sub-intervals, summing sample values of the integrand inside those sub-intervals multiplied by their lengths, and letting the number of sub-intervals tend to infinity.
Alternative form of pentice
関数がリーマン積分の意味で可積分かどうかを判断するには、積分区間を小区間に分割し、各小区間内の関数値にその長さを掛けて合計した和（リーマン和）の数が無限に増える極限、つまり分割の最大幅がゼロに近づくときのこれらの和の極限を調べる必要がある。
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