d'Alembert, Jean le Rond (1717-1783)

d'Alembert was a French mathematician, physicist, philosopher, and music theorist. A second order linear partial differential equation that describes waves (light, sound, and water) is sometimes referred to as d'Alembert's equation.

Stamps

Stamp	Description
	France, 20fr + 10fr, 19859 Scott: B332 SP209