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Jean Le Rond D'Alembert
Jean-Baptiste le Rond d'Alembert ( ; ; 16 November 1717 – 29 October 1783) was a French mathematician, mechanician, physicist, philosopher, and music theorist. Until 1759 he was, together with Denis Diderot, a co-editor of the ''Encyclopédie''. D'Alembert's formula for obtaining solutions to the wave equation is named after him. The wave equation is sometimes referred to as d'Alembert's equation, and the fundamental theorem of algebra is named after d'Alembert in French. Early years Born in Paris, d'Alembert was the natural son of the writer Claudine Guérin de Tencin and the chevalier Louis-Camus Destouches, an artillery officer. Destouches was abroad at the time of d'Alembert's birth. Days after birth his mother left him on the steps of the Saint-Jean-le-Rond de Paris church. According to custom, he was named after the patron saint of the church. D'Alembert was placed in an orphanage for foundling children, but his father found him and placed him with the wife of a glazi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Maurice Quentin De La Tour
Maurice Quentin de La Tour (; 5 September 1704 – 17 February 1788) was a French painter who worked primarily with pastels in the Rococo style. Among his most famous subjects were Voltaire, Rousseau, Louis XV and the Madame de Pompadour. Biography Maurice Quentin de La Tour was born in Saint-Quentin, Aisne, Saint-Quentin, the third son of a musician, François de La Tour. François was from Laon and he was the son of a master mason, Jean de La Tour, of Laon and Saint-Quentin, who died in 1674. François de La Tour apparently was successively a trumpet-player for the rifle regiment of the Duc du Maine, and musician to the master of the collegiate church of Saint-Quentin. He is popularly said to have disapproved of his son taking up the arts, but there is nothing to support this. According to François Marandet in 2002, an apprenticeship was arranged for the young Maurice, with a painter named Dupouch, from 12 October 1719, but it is not known when this contract was terminated. Lit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
D'Alembert's Principle
D'Alembert's principle, also known as the Lagrange–d'Alembert principle, is a statement of the fundamental classical physics, classical laws of motion. It is named after its discoverer, the French physicist and mathematician Jean le Rond d'Alembert, and Italian-French mathematician Joseph Louis Lagrange. D'Alembert's principle generalizes the principle of virtual work from statics, static to dynamical systems by introducing ''forces of inertia'' which, when added to the applied forces in a system, result in ''dynamic equilibrium''. D'Alembert's principle can be applied in cases of nonholonomic constraint , kinematic constraints that depend on velocities. The principle does not apply for irreversible displacements, such as sliding friction, and more general specification of the irreversibility is required. Statement of the principle The principle states that the sum of the differences between the forces acting on a system of massive particles and the time derivatives of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
