Riemann-Stieltjes Integral

The Riemann-Stieltjes integral is a generalization of the ordinary Riemann integral, named for the mathematicians Bernhard Riemann and Thomas Joannes Stieltjes, whose definition of the integral was first published by Stieltjes in 1894. It serves as an instructive and useful precursor to the Lebesgue integral and is a valuable tool for unifying equivalent forms of statistical theorems that apply to both discrete and continuous probability. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/