didericis 435f055d82 nested_level_duals: scaffold paper (shelved for alternative approach) ...

New paper introducing the dual (inner/weak dual) of a maximal planar graph,
dual depth (BFS-derived min level over a face's vertices), and a Tait-based
framing of a minimal 4CT counterexample via nested level duals. Includes a
dual-depth figure and its generator. Shelved per closing note in favour of an
alternative approach.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-05-22 17:36:11 -04:00

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