Lemma 7.13 All simple planar graphs have a vertex of degree at most 5.
I just read this lemma... wont this lemma fail on wheel of n>5 or am I missing something?
Wheel Graphs: https://en.wikipedia.org/wiki/Wheel_graph
2026-03-27 07:17:05.1774595825
All simple planar graphs have a vertex of degree at most $5$ (wheel of $n>5$).
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