I find a result that "if a graph G is K4-minor free with ∆ ≥ 3 then the chromatic index χ′(G) ≤ ∆ (G is belongs to Class 1)", but I cannot find the proof of it. It is about edge coloring. Thank you!
2026-04-07 05:21:31.1775539291
The proof of K4-minor free is Class 1.
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