LAGRANGE, Joseph Louis, (1736-1813). De la Résolution des Équations numériques de tous les Degrés. Paris: Duprat, An VI [1798]. 4 o (254 x 192 mm). (Dampstaining to upper margin.) Contemporary calf (some wear to spine and edges). FIRST EDITION in book form originally published in 1769 and 1770 in journals. In this work, Lagrange "gives the method of approximating to the real roots of an equation by means of continued fractions, and enunciates several other theorems. He also here explains how the equation whose roots are the squares of the differences of the roots of the original equation may be used so as to give considerable information as to the position and nature of those roots." Ball, A Short Account of the History of Mathematics p. 411; Riccardi I (2), 4.
LAGRANGE, Joseph Louis, (1736-1813). De la Résolution des Équations numériques de tous les Degrés. Paris: Duprat, An VI [1798]. 4 o (254 x 192 mm). (Dampstaining to upper margin.) Contemporary calf (some wear to spine and edges). FIRST EDITION in book form originally published in 1769 and 1770 in journals. In this work, Lagrange "gives the method of approximating to the real roots of an equation by means of continued fractions, and enunciates several other theorems. He also here explains how the equation whose roots are the squares of the differences of the roots of the original equation may be used so as to give considerable information as to the position and nature of those roots." Ball, A Short Account of the History of Mathematics p. 411; Riccardi I (2), 4.
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