Merge pull request #4378 from TKanX/main

Add topics: Einstein problem

Author: tomthorogood

topics/einstein-problem/einstein-problem.png

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+---
+display_name: Einstein problem
+logo: einstein-problem.png
+related: tridecco
+short_description: The Einstein problem seeks a single tile shape that can tessellate a plane only nonperiodically, known as an "einstein".
+topic: einstein-problem
+wikipedia_url: https://en.wikipedia.org/wiki/Einstein_problem
+---
+
+The Einstein problem in plane geometry involves finding a single prototile that can tessellate a plane only in a nonperiodic way, known as an "einstein." This term plays on the German phrase "ein Stein," meaning "one stone." The strictest form of this problem was solved in 2023, extending the exploration of nonperiodic tiling and related geometric concepts.