Alembert, Jean le Rond d

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Alembert, Jean le Rond d' (1717–83) French mathematician and philosopher. D'Alembert was a leading figure in the Enlightenment. He was Diderot's co-editor on the first edition of the Encyclopédie (1751) and contributed the “Preliminary Discourse”. His systematic Treatise on Dynamics (1743) provided a solution (D'Alembert's principle) which enables Newton's third law of motion to be applied to moving objects.

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