[10 scientific papers]. Zur Theorie der aus n Haupteinheiten gebildeten complexen Grossen. Sachs, K. Berichte der K. Sachs. Gesellschaft der Wissenschaften mathematisch-physiche classe.

Leipzig: 1892., 1892. 8vo. Contemporary maroon half cloth, German paste-paper over boards; rubbed. PROVENANCE: F. Engel. Very good. This collection of 10 papers are among the very earliest penned by Scheffers. / Inventory: [I]: Zur Theorie der aus n Haupteinheiten gebildeten complexen Grossen. Sachs, K. Berichte der K. Sachs. Gesellschaft der Wissenschaften mathematisch-physiche classe. Sitzung AM 2. December 1889. Proportionen in der bildenden Kunst. pp. 290-307; [II]: Ueber die Berechnung von Zahlensystemen. pp. 400-457; [III]: Verzerrung bei perspectiver Abbildung ebener Figuren. Vorgelegt v.d.w. Mitgliede A. Mayer. 1892. pp. 162-176; [IV]: Curvenschaaren, die auf jeder Geraden eine Involution bestimmen. Vorgelegt von dem ao. Mitgliede Engel. 1892. pp. 269-278; [V]: Verallgemeinerung der Grundlagen der gewohnlich complexen Functionen. Vorgelegt v. d. o. M. Sophus Lie. Leipzig, 1893. pp. 828-848. [VI]: Verallgemeinerung der Grundlagen der gewohnlichen complexen Functionen. Zweite Abhandlung. Vorgelegt von Herrn Lie. Leipzig, 1894. pp. 120-124. [VII]: Proportionen in der bildenden Kunst. Briefe von O. Scheffers, Lehrer am herzogl. Realgymnasium und am herzogl. Gymnasium zu Meiningen, an K. Keiser, Lehrer an der stadt. Gewerbeschule zu Leipzig. 1892. 1-38 pp. [VIII]: PaAdagogische Zeitung: Das mathematische Institut der Universitat zu Leipzig. pp. 385-400; [IX]: Zuruckfuhrung Complexer Zahlensysteme auf Typische Formen. . . Leipzig, 1891. 1-98 pp. [X]: Ueber die Reducibilitat complexer Zahlensysteme. 1893. pp. 601-604. / The index to the booklet is signed F. Engel [Friedrich Engel (1861–1941) German mathematician, studied at the University of Leipzig and was a collaborator with Sophus Lie]. "As a student Scheffers was greatly influenced by Sophus Lie, who was professor at the University of Leipzig from 1886 to 1898. He followed Lie's suggestions in choosing topics for . . . his doctoral dissertation. . . Scheffers' favorite field of study was geometry and, more specifically, the differential geometry of intuitive space. In this area he was a master at discovering many properties of particular curves and surfaces and their representation; he also possessed a gift for giving an easily understandable account of them. . . " / Georg Scheffers, German mathematician, specialized in differential geometry. He was born in the village of Altendorf near Holzminden. Scheffers enrolled at the University of Leipzig where he studied with Felix Klein and Sophus Lie, taking his doctorate degree in 1890. Scheffers was a coauthor with Lie for three of the earliest expressions of Lie theory. - DSB, XII, p. 150. (Inventory #: EEG1167)