LAGRANGE, Giuseppe Luigi. De la Résolution des Equations Numériques de tous les Dégrés. Paris, Duprat, An VI [1798]

4to, mm. 250x180; Contemporary full calf binding, title and ornaments in gold on the spine ; pp. VIII, 268. Ex-libris “G. B. Tomaselli” pasted on the inside cover. Stamp of extinxt library on the Titlepage.

Rare first edition. Really imporatnt work on mathematics. DSB: “It is a reissue of memoirs originally published on the same subject … preceded by a fine historical introduction and followed by numerous notes.” I due scritti di algebra qui riuniti erano apparsi nella Raccolta delle Memorie dell’Accademia di Berlino rispettivamente nel 1767 e nel 1768. Ball: “...the fruit of his lectures at the Polytechnic. In this he 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.” Also, here it provides the proof that every equation has to have a root, a theorem which previously had been considered self-evident. Kline: “Lagrange worked in many branches of mathematics - the theory of numbers, the theory of algebraic equations, the calculus - ... and in many branches of physics, his chief interest was the application of the law of gravitation to planetary motion.”

DSB VII, 559-573; Ball, A Short Account of the History of Mathematics, p. 411; Kline, Math. Thought, 493-94.

Spread foxing, still fine specimen.Il lotto viene venduto provvisto di licenza d'esportazione/The lot is offered with a valid export licence.