1) Cartesians are his followers 2) Cogito ergo sum man 3) Cogito ergo sum philosopher 4) French philosopher 5) Great mathematician 6) Mathematician 7) Philosopher 8) Rene descartes Found on https://www.crosswordclues.com/clue/descartes
[plotting tool] descartes is a platform independent image, data, and function plotter, with underlying Python scripting in the background. Its source code is released under the GNU GPL licence. ... Found on http://en.wikipedia.org/wiki/Descartes_(plotting_tool)
Rene Descartesnoun French philosopher and mathematician; developed dualistic theory of mind and matter; introduced the use of coordinates to locate a point in two or three dimensions (1596-1650) Found on https://www.encyclo.co.uk/local/20974