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Jean-Marie Duhamel
Jean-Marie Constant Duhamel (Saint-Malo, 5 February 1797 – Paris, 29 April 1872) was a French mathematician and physicist. His studies were affected by the troubles of the Napoleonic era. He went on to form his own school ''École Sainte-Barbe''. Duhamel's principle, a method of obtaining solutions to inhomogeneous linear evolution equations, is named after him. He was primarily a mathematician but did studies on the mathematics of heat, mechanics, and acoustics.〔(John J O'Connor and Edmund F Robertson. The MacTutor History of Mathematics archive )〕 He also did work in calculus using infinitesimals. Duhamel's theorem for infinitesimals says that the sum of a series of infinitesimals is unchanged by replacing the infinitesimal with its principal part.〔H. J. Ettlinger (1922) "A Simple Form of Duhamel's Theorem and Some New Applications", American Mathematical Monthly 29(7): 239–50〕
== Honours ==
* 19617 Duhamel, asteroid named after him.
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