D. D. Mordukhai-Boltovskii, “Parallelism and perpendicularity of straight lines, planes and hyperplanes in three-dimensional and four-dimensional Lobachevskii spaces”, Uspekhi Mat. Nauk, 1951, Volume 6, Issue 4(44),Pages <nobr>176

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Uspekhi Mat. Nauk, 1951 Volume 6, Issue 4(44), Pages 176–183 (Mi rm6871)

Scientific notes and problems

Parallelism and perpendicularity of straight lines, planes and hyperplanes in three-dimensional and four-dimensional Lobachevskii spaces

D. D. Mordukhai-Boltovskii

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