POINCARÉ, H. Leçons sur la théorie mathématique de la lumière. Réd. p. J. Blondin. (&) Tom. II: Nouvelles études sur la diffraction. Théorie de la dispersion de Helmholtz. Réd. p. M. Lamotte & D. Hurmuzescu. Par., G. Carré, 1889-92. 2 vols. iv, 408; vi, 310 pp. -- Id. Les oscillations électriques. Leçons professés pendant le premier trimestre 1892-1893. Réd. p. M.Ch. Maurain. Par., G. Carré, 1894. (4), 343 pp. -- Tog. 3 vols. Uniformly bound in cont. hcf. binds. w. dec. gilt backs & black letterpieces. (Bottom of the spine of the latter a bit glued, previous owner stamps on free endpapers, but a very good set).
Exceptionally rare first editions. "The development of mathematics in the nineteenth century began under the shadow of a giant, Carl Friedrich Gauss; it ended with the domination by a genius of similar magnitude, Henri Poincaré (…) For more than twenty years Poincaré lectured at the Sorbonne on mathematical physics; he gave himself to that task with his characteristic thoroughness and energy, with the result that he became an expert in practically all parts of theoretical physics, and published more than seventy papers and books on the most varied subjects, with a predilection for the Théories of light and of electromagnetic waves." (DSB XI, p. 51, 58). - From the library of Gustaf Kobb.€ 750