Let g be a graph then g is planar resp outerplanar if and


Question: Let G be a graph. Then G is planar (resp. outerplanar) if and only if each block of G is planar (resp. outerplanar) ? Let G be a ring graph. Prove that G is outerplanar if and only if G does not contain a subdivision of K23 as a subgraph.

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Mathematics: Let g be a graph then g is planar resp outerplanar if and
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