9464
EXPLORE
LATEST
ABOUT
AUTHORING AREA
PARTICIPATE
Your browser does not support JavaScript or it may be disabled!
Mondrian Four-Coloring
Any planar map can be colored with four colors so that no two regions of the same color touch each other.
This Demonstration uses the following method to four-color each map:
1. A map of rectangles is converted to a cubic graph (not shown).
2. Cycle set
is a non-unique Hamiltonian cycle. Color its edges with two colors.
3. Eliminate one color of
and color the edges that are not in
in a third color. The result is a cycle set
in two colors.
4.
and
form the boundaries of two regions
and
5. Four cases leads to four possible colors for a rectangle, according to whether it is inside or outside
or
.
The method does not always work, since some cubic graphs exist that are not Hamiltonian. They are still four-colorable, but not by this method.
Contributed by:
Ed Pegg Jr
THINGS TO TRY
Automatic Animation
SNAPSHOTS
DETAILS
Ed Pegg Jr, "
Math Games: Square Packing
," Dec. 1, 2003.
RELATED LINKS
Four-Color Maps
(
Wolfram Demonstrations Project
)
Four-Color Theorem
(
Wolfram
MathWorld
)
Mrs. Perkins's Quilt
(
Wolfram
MathWorld
)
Mrs. Perkins’s Quilts
(
Wolfram Demonstrations Project
)
Remembering Martin Gardner
(
Wolfram Blog
)
Tait's Hamiltonian Graph Conjecture
(
Wolfram
MathWorld
)
PERMANENT CITATION
Ed Pegg Jr
"
Mondrian Four-Coloring
"
http://demonstrations.wolfram.com/MondrianFourColoring/
Wolfram Demonstrations Project
Published: July 21, 2010
Share:
Embed Interactive Demonstration
New!
Just copy and paste this snippet of JavaScript code into your website or blog to put the live Demonstration on your site.
More details »
Download Demonstration as CDF »
Download Author Code »
(preview »)
Files require
Wolfram
CDF Player
or
Mathematica
.
Related Demonstrations
More by Author
Four-Color Maps
Ed Pegg Jr
Mrs. Perkins's Quilts
Ed Pegg Jr and Richard K. Guy
Mondrian Puzzles
Ed Pegg Jr
Packing Squares with Side 1/n
Ed Pegg Jr
The Circles of Descartes
Ed Pegg Jr
A 2-pire Map
Ed Pegg Jr
Named Colors
Ed Pegg Jr
Color Angles
Jon Perry
Color Relationships
Jeremy Davis
Leonardo's Dissection of a Motif to a Rectangle
Izidor Hafner
Related Topics
Algorithms
Art
Color
Graph Theory
Recreational Mathematics
Tiling
Browse all topics
Note: To run this Demonstration you need Mathematica 7+ or the free Mathematica Player 7EX
Download or upgrade to
Mathematica Player 7EX
I already have
Mathematica Player
or
Mathematica 7+