# Translations:D’Alembert’s solution/15/en

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Jean-le-Rond d’Alembert was born in Paris on 16 November 1717, and died there on 29 October 1783. He enunciated the principle known by his name (d’Alembert, 1743^{[1]}). D’Alembert’s principle allows the reduction of a dynamic problem into a static problem. This feat is accomplished by introducing a fictitious force equal in magnitude to the product of the mass of the body and its acceleration but in a direction opposite to the direction of acceleration. The result can be inferred from Newton’s third law of motion, the full consequences of which had not been realized previously. This principle enabled mathematicians to obtain the differential equations of motion for any rigid system.

- ↑ d’Alembert, J., 1743, Traité de Dynamique: Paris.