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(Not) Tiling a Triangle of Dots

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Visit this site: http://faculty.plattsburgh.edu/don.west/tiling/
Author:Don West, Department of Mathematics, SUNY Plattsburgh
Description: A triangular array of dots can never be tiled by three-in-line tiles, and can be tiled by three-in-a-triangle tiles only if the size of the array is congruent to 0, 2, 9, or 11 (mod 12). The author gives an elementary proof of these two results, not involving Conway's tile group.
Levels: College
Languages: English
Math Topics: Discrete Math

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