Marie Crous (fl. 1641),Ta kasan ce wata bafaranshi yace mai ilimin lissafi kuma. Ta gabatar da tsarin adadi ga Faransa a karni na 17. Ya zo ne daga asalin asali, Marie Crous ta zama fitacciyar marubuciya kuma malama a Charlotte-Rose de Caumont La Force . An buga ta a shekarar 1636, kuma a shekarar 1641 ta buga wani bincike kan tsarin adadi, wanda ta sadaukar da ita ga "gimbiya mai sanyin saffron" Madame de Combalet, Duchesse d'Aiguillon, yayar Cardinal de Richelieu kuma sanannen majiɓinci; ta kasance abokiyar Marin Mersenne . Koyaya, mashahuran mambobi na masana ilimi da masana kimiyya a cikin tsarin addinin Katolika na Minim Roman Katolika ba za a taɓa ambata ta ba, wanda ya mamaye binciken kimiyya a Faransa a wannan lokacin, kuma ba a taɓa yarda da ita a matsayin mace mai ilimi ba. Her work, printed by Simon Stevin, goes well beyond what was provided at the time in calculation manuals. She wrote, There is no book to be found other than this one where this invention is taught, being due to the vigilant work of your very humble servant.