Jean le Rond d'Alembert

Jean Le Rond d'Alembert 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, fundamental theorem of algebra is named in his honour.