• publisher: Chicago [etc.] Open Court Publishing Company
  • creator: Lobachevskiĭ, N. I. (Nikolaĭ Ivanovich), 1792-1856 Halsted, George Bruce, 1853-1922, tr
  • contributor: Halsted, George Bruce, 1853-1922, tr.
  • Keyword: Geometry, Non-Euclidean.
  • years: 1914.
  • pages: 50 p.
  • language: eng
  • class: QA685
  • download: pdf file