Duhamel's principle, in partial differential equations it gives the solution to the nonhomogenous wave equation (named for Jean-Marie Constant Duhamel)
Duhamel's integral is used in engineering / response theory to calculate the response of a linear system to an arbitrary excitation, provided the excitation to an impulse function is known
Duhamel's formula, a solution to general inhomogeneous linear equations [1]
19617 Duhamel, an asteroid named for Jean-Marie Constant Duhamel
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