Online Book Subjects: Number theory Displaying 1 - 2 of 2 Disquisitiones arithmeticae Gauss, Carl Friedrich In commiss. apud Gerh. Fleischer, jun 1801 Varia opera mathematica Fermat, Pierre de; Fermat, Samuel de; Apollonius, of Perga apud Johannem Pech 1679 108. Fermat, along with Descartes, was one of the leading mathematicians of the early 17th century.