Last Updated：2025/12/05
Topologists often describe the real projective plane as the sphere with antipodal points identified, making it a fundamental example of a nonorientable surface.
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Topologists often describe the real projective plane as the sphere with antipodal points identified, making it a fundamental example of a nonorientable surface.
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位相数学者はしばしば実射影平面を、対蹠点を同一視した球面として記述し、それが非向き付け可能な基本的な曲面の例になると考える。
