Lastly, it is worth mentioning the
following quotation by Lie Sophie’s:
“It may be said that the conceptions of differential quotient and integral which
in their origin certainly go back to Archimedes were introduced in Science by the
investigations of Kepler, Descartes, Cavalieri, Fermat and Wallis The discovery
that differentiation and integration are inverse operations belongs to Newton
and Leibnitz” DIFFERENTIAL EQUATIONS
379
�He who seeks for methods without having a definite problem in mind
seeks for the most part in vain – D