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didericis b175f0ab59 Refute inner-boundary conjecture with n=14 counterexample
The 14-vertex 3-connected triangulation at plantri index 263993 has
no vertex source admitting a witnessing 4-colouring; the level-cycle
conjecture still holds on it via v0=10.  Reorder the section so the
level-cycle conjecture follows the failed inner-boundary refinement.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-06-01 21:57:05 -04:00
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