Jean Le Rond d'Alembert ( DAL-əm-BAIR; French: [ʒɑ̃ lə ʁɔ̃ dalɑ̃bɛʁ]; 16 November 1717 – 29 October 1783) was a French mathematician, physicist, philosopher, and music theorist. Until 1759 he was, together with Denis Diderot, a co-editor of the Encyclopédie.
His most famous achievements include the wave equation, also known as d'Alembert's equation, and D'Alembert's formula for solving said equation. In French, the fundamental theorem of algebra is named in his honour.
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