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A geometry problem that has been puzzling scientists for 60 years has likely just been solved by an amateur mathematician with a newly discovered 13-sided shape.
David Smith (amateur mathematician) - Wikipedia
Newfound Mathematical 'Einstein' Shape Creates a Never-Repeating Pattern
Angela D. Lee on LinkedIn: Newly discovered 'einstein' shape can do something no other tile can do
UK hobbyist stuns maths world with 'amazing' new shapes
Modeling the Newly Discovered Aperiodic Monotile with Geometiles - Geometiles®
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Space + Science
Retired Yorkshireman solves elusive 'Einstein tile' maths problem
The Hat aka einstein shape - Share your work - Affinity