Last Updated：2025/12/05
Sentence
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。
Quizzes for review
Topologists often describe the real projective plane as the sphere with antipodal points identified, making it a fundamental example of a nonorientable surface.
See correct answer
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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Related words
real projective plane
Noun
(geometry)
A
three-dimensional
vector
space
over
the
field
of
real
numbers
in
which
one-dimensional
linear
subspaces
are
considered
as
“points”
and
two-dimensional
linear
subspaces
are
considered
as
“lines”.
Equivalently,
a
sphere
in
which
pairs
of
antipodal
points
are
considered
as
“points”
and
great
circles
are
considered
as
“lines”.
Japanese Meaning
実射影平面：実数体上の3次元ベクトル空間において、1次元の線形部分空間を「点」、2次元の線形部分空間を「直線」として扱う幾何学的対象。 / 実射影平面：球面上において、反対称な（対向する）点を1つの点として、また大円を直線として扱う幾何学的構造。
Related Words
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