Last Updated：2025/12/02
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In our topology seminar, we spent the afternoon debating a new proof of the four color theorem and its implications for planar graphs.
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In our topology seminar, we spent the afternoon debating a new proof of the four color theorem and its implications for planar graphs.
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Related words
four color theorem
Proper noun
(graph
theory)
A
theorem
stating
that
given
any
separation
of
a
plane
into
contiguous
regions,
producing
a
figure
called
a
map,
no
more
than
four
colors
are
required
to
color
the
regions
so
that
no
two
adjacent
regions
have
the
same
color
(adjacent
being
defined
as
two
regions
sharing
a
boundary,
not
counting
corners,
in
which
three
or
more
regions
share
a
boundary).
Japanese Meaning
平面上の任意の連続した領域（地図を構成する各国や地域）について、隣接する領域（共通の境界を持つ領域）が同じ色にならないように色分けする際、必要とされる色の数は常に4色以下であるという定理
English - English
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