Bolyai, Jǹos, 1802-1860.
The science absolute of space, independent of the truth or falsity of Euclid's axiom XI (which can never be decided a priori) ... By John Bolyai. Translated from the Latin by Dr. George Bruce Halsted.
Geometry, Non-Euclidean.
Space and time.
Hyperspace
Halsted, George Bruce, 1853-1922, translator.