Geometrical researches on the theory of parallels
By: by Nicholaus Lobatschewsky ; translated from the original by George Bruce Halsted
Contributors: Halsted, George Bruce, 1853-1922
Edition: [4th ed.]
Publisher: [University of Texas
Published: 1891
Place of publication: Austin
Language: eng
Number of pages: 50
Subjects: Geometry, Non-Euclidean