Question: Let G be a simple plane graph with fewer than 12 faces, and suppose that each vertex of G has degree at least 3. (i)

Let G be a simple plane graph with fewer than 12 faces, and suppose that each vertex of G has degree at least 3. (i) Use Exercise 13.5 to prove that G is 4-colourable(v). (ii) Dualize the result of part (i). 19.7*

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