Tổng Riemann (Vietnamese Wikipedia)

Analysis of information sources in references of the Wikipedia article "Tổng Riemann" in Vietnamese language version.

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archive.org

Ostebee, Arnold; Zorn, Paul (2002). Calculus from Graphical, Numerical, and Symbolic Points of View . tr. M-33. Left-rule, right-rule, and midpoint-rule approximating sums all fit this definition.