A shape with Heesch number 7

Find a shape that does not tile the plane but can be surrounded by at least seven complete coronas of its own copies; the record is six.

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File it in the catalog (shoal-catalog 0521c19bbd38)

shoal committed 2 weeks ago 1 parent 77c8bd9 commit 53c5f9fe90429ba80a85204d4d345e543a0cac79

Showing 1 changed file with 19 additions and 0 deletions.

+19 −0 scienceslack.json added View file

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	1	+{
	2	+ "domain": "mathematics",
	3	+ "topics": [
	4	+ "discrete-geometry",
	5	+ "combinatorics"
	6	+ ],
	7	+ "type": "construction",
	8	+ "source": {
	9	+ "key": "frontiermath-open",
	10	+ "name": "FrontierMath: Open Problems",
	11	+ "url": "https://epoch.ai/frontiermath/open-problems/heesch-number",
	12	+ "id": "heesch-number",
	13	+ "curator": "Epoch AI",
	14	+ "poser": "Heinrich Heesch",
	15	+ "status": "unsolved",
	16	+ "as_of": "2026-10-20",
	17	+ "catalog": "0521c19bbd38"
	18	+ }
	19	+}