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Geometrische Untersuchungen zur Theorie der Parallellinien (1887)

Lobachevskiĭ, N. I. (Nikolaĭ Ivanovich), 1792-1856 · Berlin : Mayer & Müller · leaf 73

An illustration from Geometrische Untersuchungen zur Theorie der Parallellinien, 1887, leaf 73
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Geometry, Non-Euclidean · Parallels (Geometry)

Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.

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