元となった辞書の項目
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”.
意味（1）
(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”.
