Lobachevski was the first to publish non-Euclidean geometry. Originally titled: Geometrical Researches on The Theory of Parallels. This is an unabridged printing, to include all figures, from the translation by Halsted.
Lobachevski was the first to publish non-Euclidean geometry. Originally titled: Geometrical Researches on The Theory of Parallels. This is an unabridged printing, to include all figures, from the translation by Halsted.