Leningrad - Moscow. ONTI GTTI 1934. 226 p. hardcover, regular format This book is devoted to the elliptical form of Riemann’s non-Euclidean geometry and proposes its construction in a natural elementary-synthetic way. The author aims to fill the lack of research in this area, step by step bringing the reader from the strict justification of axioms to trigonometric formulas and the beginnings of analytical geometry. The paper examines in detail the key features of elliptical space, including the one-sidedness of its plane. The publication is an abbreviated version of the fundamental work, marked by the Narkompros Prize, and serves as an excellent introduction to geometry, which formed the basis of the theory of relativity.
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