Note 13 — 1905
S. S. (Samuel Solomonovitch) Koteliansky translation
Nikolay Ivanovich Lobachevsky (1793-1856), the great Russian mathematician and geometrist (founder of the non-Euclidean geometry).
S. S. (Samuel Solomonovitch) Koteliansky translation
Nikolay Ivanovich Lobachevsky (1793-1856), the great Russian mathematician and geometrist (founder of the non-Euclidean geometry).