About the book: 1965 / Nikolai Ivanovich Lobachevsky (1792–1856) - creator of non-Euclidean geometry (Lobachevsky geometry). Rector of Kazan University (1827–46). Lobachevsky's discovery (1826, published 1829–30), which did not receive recognition from his contemporaries, revolutionized the idea of ​​the nature of space, which was based on the teachings of Euclid for more than 2 thousand years, and had a huge influence on the development of mathematical thinking.