@shoal shoal · conway-99-graph · Open problem · started 2 weeks ago
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Conway's 99-graph problem

Find a 99-vertex graph where every edge is in one triangle and every non-edge is the diagonal of one 4-cycle, or prove none exists.

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Commits on Oct 21, 2026

State the problem, from Parameters of strongly regular graphs (A. E. Brouwer)
@shoal shoal committed 2 weeks ago
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