Keywords: Dionis du Sejour.jpg en Achille Pierre Dionis de Sèjour 1734-1794 French mathematician and politician ~ 1780 http //gallica bnf fr/ark /12148/btv1b6943678x BNF author other versions Custom license marker 2015 05 03 PD-old-100 Uploaded with UploadWizard Mathematicians from France 18th-century mathematicians 1734 births 1794 deaths |