Prominent French physicist (1872-1946) who developed Langevin dynamics and the Langevin equation; he was placed under house arrest by the Vichy regime for his antifascist activities during World War II. Uncommon ALS in French, signed “P. Langevin,” one page, 8.25 x 10.5, January 15, 1943. Untranslated letter expressing gratitude. In fine condition.
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