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written by Jim Loy
This informal introduction by Jim Loy to the four color theorem is designed specifically for a general, non-technical audience. Using simple language, examples and images, Loy explains the theorem and how it was proven by researchers. The author also briefly shows how the theorem became a part of the graph theory by displaying a map than the equivalent graph.
Subjects Levels Resource Types
Other Sciences
- Mathematics
- Informal Education
- Reference Material
= Article
- Audio/Visual
= Photograph
Intended Users Formats Ratings
- General Publics
- text/html
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Additional Information
Physics To Go This resource was a Physics To Go feature from September 1, 2010 until September 16, 2010. View the feature here!


Access Rights: Free access
Restriction: © 1999 Jim Loy
Has a copyright or other licensing restriction.
Keywords: angles, four color theorem, graph, graph theory, lines, map, vertices
Record Creator: Metadata instance created July 30, 2010 by Foha Rafiq
Record Updated: Jul 30, 2010 by Ed Lee
Last Update
when Cataloged:
January 1, 1999
ComPADRE is beta testing Citation Styles!

Record Link
AIP Format
J. Loy, (1999), WWW Document, (http://www.jimloy.com/geometry/4color.htm).
AJP/PRST-PER
J. Loy, Four Color Theorem Intro (1999), <http://www.jimloy.com/geometry/4color.htm>.
APA Format
Loy, J. (1999, January 1). Four Color Theorem Intro. Retrieved September 1, 2014, from http://www.jimloy.com/geometry/4color.htm
Chicago Format
Loy, Jim. Four Color Theorem Intro. January 1, 1999. http://www.jimloy.com/geometry/4color.htm (accessed 1 September 2014).
MLA Format
Loy, Jim. Four Color Theorem Intro. 1999. 1 Jan. 1999. 1 Sep. 2014 <http://www.jimloy.com/geometry/4color.htm>.
BibTeX Export Format
@misc{ Author = "Jim Loy", Title = {Four Color Theorem Intro}, Volume = {2014}, Number = {1 September 2014}, Month = {January 1, 1999}, Year = {1999} }
Refer Export Format

%A Jim Loy
%T Four Color Theorem Intro
%D January 1, 1999
%U http://www.jimloy.com/geometry/4color.htm
%O text/html

EndNote Export Format

%0 Electronic Source
%A Loy, Jim
%D January 1, 1999
%T Four Color Theorem Intro
%V 2014
%N 1 September 2014
%8 January 1, 1999
%9 text/html
%U http://www.jimloy.com/geometry/4color.htm


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Citation Source Information

The AIP Style presented is based on information from the AIP Style Manual.

The APA Style presented is based on information from APA Style.org: Electronic References.

The Chicago Style presented is based on information from Examples of Chicago-Style Documentation.

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