The Shannon capacity of the 7-cycle

Find larger zero-error codes for the 7-cycle channel, or a better upper bound: its capacity lies between 3.25883 and 3.3177.

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	2	+ "domain": "mathematics",
	3	+ "topics": [
	4	+ "graph-theory",
	5	+ "coding-theory"
	6	+ ],
	7	+ "type": "construction",
	8	+ "also": [
	9	+ "proof"
	10	+ ],
	11	+ "cover": {
	12	+ "motif": "graph",
	13	+ "n": 7
	14	+ },
	15	+ "source": {
	16	+ "key": "optimization-constants",
	17	+ "name": "Optimization Constants in Mathematics",
	18	+ "url": "https://teorth.github.io/optimizationproblems/constants/9a.html",
	19	+ "id": "9",
	20	+ "curator": "Terence Tao and contributors",
	21	+ "status": "open",
	22	+ "as_of": "2026-10-20",
	23	+ "catalog": "0521c19bbd38"
	24	+ }
	25	+}