RT Book, Section T1 Non-Euclidean geometries: Gauss, Lobachevskiĭ and Bolyai. (Spanish:Las Geometrías no euclídeas: Gauss, Lobatchewsky y Bolyai) A1 Montesinos Amilibia, José María AB The author presents the origin of non-Euclidean geometry in the works of J. Bolyai, C. F. Gauss and N. I. Lobachevskiĭ. The main ideas from the Appendix by Bolyai (1831) and from Pangeometria by Lobachevskiĭ (posthumous, 1855) and the reaction of Gauss to the publications of Lobachevskiĭ and Bolyai are presented. The paper contains many excerpts from the works of Lobachevskiĭ and Bolyai and from the letters of Gauss and Bolyai. The exposition is illustrated with many figures. Brief biographies of Bolyai and Lobachevskiĭ are also included. PB Real Academia de Ciencias Exactas, Físicas y Naturales, SN 84-87125-19-0 YR 1992 FD 1992 LK https://hdl.handle.net/20.500.14352/60747 UL https://hdl.handle.net/20.500.14352/60747 LA spa NO Papers from the conference held in Madrid, February–March 1991 DS Docta Complutense RD 11 abr 2025