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LOBACHEVSKII, Nikolai Ivanovich.

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FIRST EDITION of the only substantial book published in the life-time of the author, in which he demonstrates the immediate numerical determination of algebraic equations, which was also discovered independently at about the same time by the Belgian Dandelain and the Swiss K. Gräffe. Lobachevskii was the founder of non-Euclidian geometry publishing his discoveries as

The majority of Lobachevskii's works on non-Euclidean geometry and other mathematical and scientific fields were confined primarily to journals and small pamphlets. This is the only comprehensive book to appear in his life-time, and shows his radical approach to solving equations using a synthesis of geometrical and analytical systems. Preceding Dandelain and Gräffe, he discovered how to separate the roots of equations by repeated squaring, a method suggested by Newton and in 1781 touched on by Euler. It was his unorthodox methods in this work that historians cite as essential to his solution of the parallel problem in Euclidean geometry (see Youschkevitch and Bashmakova). He originally wrote this text for a course of lectures at the University of Kazan in 1825. It was rejected by the censors for political reasons and unfortunately Lobachevskii's efforts in mathematics outside of geometry have languished in relative obscurity. According to Gnedenko, Lobachevskii should be considered one of the major precursors to the theory of relativity. The methodology utilized in both Alegebra and his paper "The Origins of Geometry," was overlooked until Einstein demonstrated that the universe was non-Euclidean in structure and that Lobachevskii's theoretical concepts had a very practical application. A.P. Youschkevitch and I.G. Baschmakova, "Algegra ili vychisleni Konechnyhy," n

*Algebra ili vychislenie konechnykh [Algebra or the Calculus of Finite Numbers].*Kazan': University Press, 1834.8

^{o}(212 x 129 mm.). (33/2 with small marginal chip not affecting text.) Contemporary green half russia and marbled boards, spine lettered and decorated in gilt, original printed wrappers bound in.*Provenance*: presentation copy (inscribed by a publisher's clerk on printed wrapper: "dem Herr Mechanikus Nez[...] zum Andenken Vom Verfas[ser]" the inscription folded to avoid the binder's knife, but 2 lines still cut of at the end).FIRST EDITION of the only substantial book published in the life-time of the author, in which he demonstrates the immediate numerical determination of algebraic equations, which was also discovered independently at about the same time by the Belgian Dandelain and the Swiss K. Gräffe. Lobachevskii was the founder of non-Euclidian geometry publishing his discoveries as

*On the Principles of Geometry*in the Kazan' Messenger in 1829-30, which included his paper read to the University Department of Physics and Mathematics in 1826 (see*Printing and the Mind of Man*293 and previous lot).The majority of Lobachevskii's works on non-Euclidean geometry and other mathematical and scientific fields were confined primarily to journals and small pamphlets. This is the only comprehensive book to appear in his life-time, and shows his radical approach to solving equations using a synthesis of geometrical and analytical systems. Preceding Dandelain and Gräffe, he discovered how to separate the roots of equations by repeated squaring, a method suggested by Newton and in 1781 touched on by Euler. It was his unorthodox methods in this work that historians cite as essential to his solution of the parallel problem in Euclidean geometry (see Youschkevitch and Bashmakova). He originally wrote this text for a course of lectures at the University of Kazan in 1825. It was rejected by the censors for political reasons and unfortunately Lobachevskii's efforts in mathematics outside of geometry have languished in relative obscurity. According to Gnedenko, Lobachevskii should be considered one of the major precursors to the theory of relativity. The methodology utilized in both Alegebra and his paper "The Origins of Geometry," was overlooked until Einstein demonstrated that the universe was non-Euclidean in structure and that Lobachevskii's theoretical concepts had a very practical application. A.P. Youschkevitch and I.G. Baschmakova, "Algegra ili vychisleni Konechnyhy," n

*Istoriko-matematicheskie issledovaniya*2, pp. 720-28; G.V. Gnedenko "O rabotah N.I. Lobachevsky po teorii veroiatnostei" ["About the Works of N.I. Lobachevsky on the Theory of Relativity"= in*Istoriko- matematicheskie issledovaniya*2, pp.129-136.