Task: Text Categorization
Input (English): Stratonovich introduced a version of this operation for stochastic processes. Another type of this operation is named after Lebesgue (le bay). Fubini's theorem specifies the conditions under which the iterated type of this operation can be performed in a different order. Doing this (*) ""by parts"" is useful for certain products of functions. Another type of this operation is named after Riemann, and it can be approximated using the rectangle method. For 10 points, name this operation which is connected to differentiation by the fundamental theorem of calculus.
Output (English): Social Science