I'm self-studying the book of Graphs on Surfaces and Their Applications, Lando & Zvonkin.
In Example 2.3.1 of Sec 2.3, the authors say, the vertex 1 is of degree 3.
Could someone tell me why so?
Thank you!
2026-03-14 10:13:39.1773483219
Degree of a vertex in Dessin d'Enfant
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