Riemann integral

noun
Rie·​mann integral | \ˈrē-ˌmän-, -mən-\

Definition of Riemann integral 

: a definite integral defined as the limit of sums found by partitioning the interval comprising the domain of definition into subintervals, by finding the sum of products each of which consists of the width of a subinterval multiplied by the value of the function at some point in it, and by letting the maximum width of the subintervals approach zero

First Known Use of Riemann integral

1914, in the meaning defined above

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The first known use of Riemann integral was in 1914

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