Summarises classical reducibility theory (Birkhoff 1913, Heesch
discharging, Appel-Haken, RSST) in modern notation, then maps it
onto the spoke-fiber decomposition: ring colorings ↔ spoke configs,
good/bad colorings ↔ realisable/unrealisable σ, D-reducibility ↔
chain-pigeonhole conductivity. Honest assessment: framework gives
vocabulary and a Sage-checkable template for small tires, but does
not give a uniform argument across tire sizes.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
didericis
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