"The infinitesimal calculus originated in the seventeenth century with the researches of Kepler, Cavalieri, Torricelli, Fermat and Barrow, but the two independent inventors of the subject, as we understand it today, were Newton and Leibniz. The subsequent controversy in the early part of the eighteenth century as to the priority of their discoveries -- one of the most notorious disputes in the history of science -- led to an unfortunate divorce of English from Continental mathematics that lasted until the end of the first quarter of the nineteenth century. Although both Newton and Leibniz developed similar ideas, Leibniz devised a superior symbolism and his notation is now an essential feature in all presentations of the subject." (PMM)