"What Vesalius was to Galen, what Copernicus was to Ptolemy, that was Lobachevski to Euclid." Lobachevski was the first to publish non-Euclidean geometry. An un
LOBACHEVSKY was the first man ever to publish a non-Euclidean geometry. Of the immortal essay now first appearing in English Gauss said, "The author has treated
Geometry: A Metric Approach with Models, imparts a real feeling for Euclidean and non-Euclidean (in particular, hyperbolic) geometry. Intended as a rigorous fir