French physicist (1892-1987) known for his theory that matter has the properties of both particles and waves, who was awarded the 1929 Nobel Prize in Physics. ALS in French, one page both sides, 6.25 x 4, March 7, 1942. Untranslated handwritten letter by Louis de Broglie, with reference to the "Institut Henri Poincaré." A pencil note below is in an unknown hand. In fine condition. Established in 1928 to promote mathematical physics, the Institut Henri Poincaré remains part of Sorbonne University.
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