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Краткий очерк основ геометрии Лобачевского - Широков П.А. 1983 PDF | DJVU Наука BOOKS SCIENCE AND STUDY
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Краткий очерк основ геометрии Лобачевского
Author: Широков П.А.
Year: 1983
Number of pages: 80
Format: PDF | DJVU
File size: 11,80 MB

Postulates of parallelism of Euclid and Lobachevsky and their connection with the question of the sum of the angles of the triangle and the question of the existence of such figures. Parallel lines and their simplest properties. The main properties of intersecting, diverging and parallel lines...

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