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p3m1 versus p31m

These two types are notoriously difficult to tell apart. An error that switched them in an early publication [reference] caused even more confusion. An excellent article by Doris Schattschneider in the American Mathematical Monthly [Sch] clarified the picture.

Test your ability to distinguish the types by classifying these four images:


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Communications in Visual Mathematics, vol 1, no 1, August 1998.
Copyright © 1998, The Mathematical Association of America. All rights reserved.
Created: 08 Jul 1998 --- Last modified: 18 Aug 1998 23:59:59
Comments to: CVM@maa.org