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A comment on Pentagon Tiling Proof Solves Century-Old Math Problem. Parent comment
https://en.wikipedia.org/wiki/Einstein_problem
"Depending on the particular definitions of nonperiodicity and the specifications of what sets may qualify as tiles and what types of matching rules are permitted, the problem is either open or solved."
https://en.wikipedia.org/wiki/Einstein_problem
"Depending on the particular definitions of nonperiodicity and the specifications of what sets may qualify as tiles and what types of matching rules are permitted, the problem is either open or solved."