LAGRANGE (Joseph-Louis de).

Lot 152
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Estimation :
600 - 800 EUR
LAGRANGE (Joseph-Louis de).
Solving the numerical equations of all degrees. Paris, Duprat, An VI (1798). In-4, stiff vellum, fillets on spine and red morocco title piece, smooth edges (contemporary binding). Riccardi, t. II, col. 4. Original edition of this treatise on arithmetic in which the mathematician Joseph-Louis Lagrange (1736-1813) gives a new method for determining the real and unequal roots of a numerical equation and provides proof that every equation has a root (cf. Cajori, A History of Mathematics, 1894, p. 264). Small wet seal of the Jesuits. Pencil note: Appartenuto al celebre astronomo P. A. Secchi. Some freckles.
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