Jean-Baptiste le Rond d'Alembert was a French mathematician, mechanician, physicist, philosopher, and music theorist. Until 1759 he was co-editor with Denis Diderot of the Encyclopédie. D'Alembert's formula for obtaining solutions to the wave equation is named after him. The wave equation is sometimes referred to as d'Alembert's equation.
Wikipedia
“Nothing is more incontestable than the existence of our sensations; …”
in the Discours préliminaire de l’Encyclopédie http://fr.wikisource.org/wiki/Discours_pr%C3%A9liminaire_de_l%E2%80%99Encyclop%C3%A9die.
Context: Nothing is more incontestable than the existence of our sensations;...
