File:Schattschneider Reconstruction of Escher's Coxeter Diagram.jpg

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Schattschneider_Reconstruction_of_Escher's_Coxeter_Diagram.jpg (440 × 227 pixels, file size: 42 KB, MIME type: image/jpeg)

Summary

Media data and Non-free use rationale
Description	Doris Schattschneider's reconstruction of the diagram of hyperbolic tiling sent by the graphic artist M. C. Escher to the mathematician H. S. M. Coxeter.
Author or copyright owner	Doris Schattschneider after M. C. Escher
Source (WP:NFCC#4)	Original publication: The Mathematical Side of M. C. Escher, Notices of the AMS, 57, 6, 706-718, 2010 Immediate source: http://www.ams.org/notices/201006/rtx100600706p.pdf
Date of publication	2010
Use in article (WP:NFCC#7)	M. C. Escher
Purpose of use in article (WP:NFCC#8)	The diagram shows the depth of the mathematical research undertaken by Escher, as understood by a practising mathematician.
Not replaceable with free media because (WP:NFCC#1)	There isn't one; the diagram could be copied and redrawn using a graphics tool but that would still be breaching Schattschneider's and Escher's copyright in the image.
Minimal use (WP:NFCC#3)	The image is the only analytic diagram used in the article. It is used only in this one article. It is greatly reduced in size.
Respect for commercial opportunities (WP:NFCC#2)	The image has long been published in an academic paper; both it and the rest of that paper are too technical to be highly commercial, but are of encyclopedic interest for the understanding of Escher's life and work.
Fair useFair use of copyrighted material in the context of M. C. Escher//en.wikipedia.org/wiki/File:Schattschneider_Reconstruction_of_Escher%27s_Coxeter_Diagram.jpgtrue

Licensing

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Fair use

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File history

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	10:48, 4 November 2015		440 × 227 (42 KB)	Chiswick Chap (talk \| contribs)	Uploading a non-free file using File Upload Wizard

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M. C. Escher