To say that Descartes was not pleased is an understatement. Descartes soon found reason to feel even more angry since he viewed Fermat's work on maxima, minima and tangents as reducing the importance of his own work La Géométrie which Descartes was most proud of and which he sought to show that his Discours de la méthode alone could give.
Upang sabihin na Descartes ay hindi natutuwa ay isang maliit. Descartes sa lalong madaling panahon na nahanap kadahilanan na pakiramdam ng mas maraming nagagalit dahil siya tiningnan Fermat ng trabaho sa maxima, minima at tangents bilang pagbabawas sa kahalagahan ng kanyang sariling trabaho La Géométrie na Descartes ay pinaka-ipinagmamalaki ng mga at kung saan siya sought upang ipakita na ang kanyang Discours de la méthode ay nag-iisa bigyan.