During this period he studied the leading mathematical works of his time including Descartes ' Géométrie and van Schooten 's additional material in the Latin edition.
Panahon na ito siya ang nangungunang-aral ng matematika gumagawa ng kanyang panahon kabilang ang mga Descartes' Géométrie at van Schooten 's karagdagang materyal sa Latin edition.