projective planes
(zoology) Any gastropod in the family Ataphridae, which is probably a synonym for the family Trochaclididae.
plural of projective plane
(science fiction) A spacecraft for relatively short journeys in the vicinity of a planet.
a basic standard by which values are measured
上級の学生たちは有限幾何学を理解するために、射影平面の性質を研究した。
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