French mathematician who specialized in celestial mechanics (1811-1877) best known for his part in the discovery of Neptune. ALS in French, signed “Urb. Le Verrier,” one page, 5.5 x 8.25, Observatoire Imperial letterhead, April 4, 1864. An untranslated handwritten letter from Urbain Le Verrier. In fine condition, with minor paper loss along the lower left edge.
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