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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
= Image/Image Set
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: Aug 12, 2016 by Lyle Barbato
Last Update
when Cataloged:
January 1, 1999
ComPADRE is beta testing Citation Styles!

Record Link
AIP Format
J. Loy, (1999), WWW Document, (
J. Loy, Four Color Theorem Intro, (1999), <>.
APA Format
Loy, J. (1999, January 1). Four Color Theorem Intro. Retrieved May 28, 2022, from
Chicago Format
Loy, Jim. Four Color Theorem Intro. January 1, 1999. (accessed 28 May 2022).
MLA Format
Loy, Jim. Four Color Theorem Intro. 1999. 1 Jan. 1999. 28 May 2022 <>.
BibTeX Export Format
@misc{ Author = "Jim Loy", Title = {Four Color Theorem Intro}, Volume = {2022}, Number = {28 May 2022}, Month = {January 1, 1999}, Year = {1999} }
Refer Export Format

%A Jim Loy %T Four Color Theorem Intro %D January 1, 1999 %U %O text/html

EndNote Export Format

%0 Electronic Source %A Loy, Jim %D January 1, 1999 %T Four Color Theorem Intro %V 2022 %N 28 May 2022 %8 January 1, 1999 %9 text/html %U

Disclaimer: ComPADRE offers citation styles as a guide only. We cannot offer interpretations about citations as this is an automated procedure. Please refer to the style manuals in the Citation Source Information area for clarifications.

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 Electronic References.

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

The MLA Style presented is based on information from the MLA FAQ.

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