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Japanese
Point-, Line-Symmetical Forms
"Point-symmetrical form" means such a form
X
as we can find a point
C
in the space and a one-to-one correspondense
f
of
X
onto itself such that
For each point
x
of
X
,
x
and
f(x)
are point-symmetrical relative to
C
.
"Line]-symmetrical form" means such a form
X
as we can find a line
L
in the space and a one-to-one correspondense
f
of
X
onto itself such that
For each point
x
of
X
,
x
and
f(x)
are line-symmetrical relative to
L
.
点対称な位置関係にある２つの図形は，あわせて１つの図形と見れば，点対称形です。
同様に，線対称な位置関係にある２つの図形は，あわせて１つの図形と見れば，線対称形です。
