1-24 of 61 Books

Geometrical researches on the theory of parallels
By N. I. Lobachevskiĭ

Parallèles
By Nicole Fouletier-Smith,Pam Le Zotte
Isoclinic n-planes in Euclidean 2n-space, Clifford parallels in elliptic (2n-1)-space, and the Hurwitz matrix equations
Isoclinic n-planes in Euclidean 2n-space, Clifford parallels in elliptic (2n-1)-space, and the Hurwitz matrix equations
By Yung-chow Wong

Curiosa mathematica, Part II, Pillow Problems
By Lewis Carroll

Theories of parallelism
By William Barrett Frankland

The celebrated theory of parallels
By Matthew Ryan
Euclid's parallel postulate
Euclid's parallel postulate
By John William Withers

Die Theorie der Parallellinien von Euklid bis auf Gauss
By Paul Stäckel

Leibniz on the Parallel Postulate and the Foundations of Geometry
By Vincenzo De Risi

Euclid's Parallel Postulate
By John William Withers
Le axiome de paralleles de Euclides a Hilbert
Le axiome de paralleles de Euclides a Hilbert
By Carl Erik Sjöstedt

Generalized Clifford parallelism
By J. A. Tyrrell

Synthetische Theorie der Cliffordschen Parallelen und der linearen Linienörter des elliptischen Raumes
By Wolfgang Vogt
Finite non-projective geometries without the axiom of parallels
Finite non-projective geometries without the axiom of parallels
By Mason Edward Henderson
Geometrische Untersuchungen zur Theorie der Parallellinien
Geometrische Untersuchungen zur Theorie der Parallellinien
By N. I. Lobachevskiĭ
Admirandum illud geometricum problema tredecim modis demonstratum
Admirandum illud geometricum problema tredecim modis demonstratum
By Francesco Barozzi
Lobachevski Illuminated
Lobachevski Illuminated
By Seth Braver
La geometria dei parallelogrammi
La geometria dei parallelogrammi
By Luigi Campedelli
Die Theorie der Parallellinien von Euklid bis auf Gauss
Die Theorie der Parallellinien von Euklid bis auf Gauss
By Paul Stäckel