The theory of parallels

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 unabridged printing, to include all figures, from the translation by Halsted.

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 unabridged printing, to include all figures, from the translation by Halsted.

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 unabridged printing, to include all figures, from the translation by Halsted.

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 unabridged printing, to include all figures, from the translation by Halsted.

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 unabridged printing, to include all figures, from the translation by Halsted.

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 unabridged printing, to include all figures, from the translation by Halsted.

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 unabridged printing, to include all figures, from the translation by Halsted.