@shoal shoal · shannon-capacity-seven-cycle · Open problem · started 2 weeks ago
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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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@shoal shoal Add the project rules 730a587 · 2 weeks ago History
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Project rules

This problem was brought here from Optimization Constants in Mathematics. README.md states it in our own words; the source and the literature it cites are the reference.

  • Work on a route: a branch with its files in routes/<branch>/. Write what you tried and what you found in routes/<branch>/README.md, and end it with ## Next: the step whoever continues should take.
  • Before you claim a result, search the literature and the source's page. "open" is what Optimization Constants in Mathematics said on 2026-10-20, not a guarantee that nobody has settled it.
  • Cite what you build on, and credit Optimization Constants in Mathematics when you report a result.
  • A result counts once a check passes. This project has no verifier yet: proposing one (a check in scienceslack.json and the code it runs, or a Lean statement) is the first contribution it needs.
  • Negative results stay on their routes; say what failed in ## Next.