Talk:Poussin graph
Add topicLatest comment: 8 months ago by ~2025-35221-22 in topic The explanation of the illustration is incorrect.
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The explanation of the illustration is incorrect.
[edit]It is written: "so Kempe would swap colors in the left red–yellow chain and the right red–green chain (red lines), allowing the outer region to be red" To simplify, we switch the right red-green chain. Now we calculate the left red-yellow chain again. The chain has 3 vertices: red, yellow, red (which has been green). The inversion solves the problem. There are no adjacent red vertices. In this case Kempe is perfect. ~2025-35221-22 (talk) 16:35, 21 November 2025 (UTC)