Heesch Numbers
Additional information
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This video features Edmund Harriss from University of Arkansas.
Extra footage from this interview: https://youtu.be/7ehaadVtaMI
Heesch's Tiling Problem by Casey Mann: http://faculty.washington.edu/cemann/Heesch.pdf
Check out the Numberphile Podcast: https://www.numberphile.com/podcast/
Penrose Tiling: https://youtu.be/QTrM-UVcgBY