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Charles-Marie-Thérèse-Léon de Tinseau d'Amondans de Gennes (1748-1822) was a military and mathematician from France in the 18th century. == Life and work == Charles Tinseau was the sixth son (from seven) of Marie-Nicolas Tinseau, ''seigneur'' de Gennes, and Jeanne Petramand de Velay, a noble family in the Franche-Comté. He entered in the ''École du Génie'' at Mézières (the Military School of Artillery of France) in 1769 and he graduated in 1771. Gaspard Monge, his professor of mathematics,〔, pages 21-23.〕 interested him in mathematics.〔, Complete Dictionary of Scientific Biography.〕 However, he followed his military career achieving the graduation of General Brigadier. In the school he, also, knew the future naturalist Justin Girod-Chantrans born at Besançon like him self. In 1772 he presented two memories in the Acadèmie Royal des Sciences (published 1774), the most interesting of both was ''Sur quelques propriétés des solides renfermés par des surfaces composées des lignes droites'', in which he demonstrates the today known as De Gua's theorem. The polemics with Jean Paul de Gua de Malves was granted because de Gua was published an other demonstration thirty years before. Apparently not de Gua, neither Tinseau can have the paternity of a theorem stated by Descartes in 17th century.〔, pàgina 643.〕 From 1789, after the French Revolution, he lived in exile due to his radical monarchic convictions. He was in permanent contact with Charles- Philippe (the future king Charles X of France) being his personal aide-de-camp.〔, MacTutor History of Mathematics.〕 From 1792 he published several politic pamphlets defending the borbonic monarchy against the power of the Etats Generaux.〔, page 53.〕 During the Napoleonic period he continued in exile and, probably, acting as agent of the Allies against France. The intransigence of his political views is evident in the dozen of political writings published between 1792 and 1805.〔 In 1816, two years after Bourbon Restoration in France in the person of Louis XVIII of France, he returned to France, but aged 68, he was retired immediately.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Charles de Tinseau d'Amondans」の詳細全文を読む スポンサード リンク
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