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Partitioning planar graph of girth 5 into two forests with maximum degree 4

Min ChenAndré RaspaudWeifan WangWeiqiang Yu — 2024

Czechoslovak Mathematical Journal

Given a graph G = ( V , E ) , if we can partition the vertex set V into two nonempty subsets V 1 and V 2 which satisfy Δ ( G [ V 1 ] ) d 1 and Δ ( G [ V 2 ] ) d 2 , then we say G has a ( Δ d 1 , Δ d 2 ) -partition. And we say G admits an ( F d 1 , F d 2 ) -partition if G [ V 1 ] and G [ V 2 ] are both forests whose maximum degree is at most d 1 and d 2 , respectively. We show that every planar graph with girth at least 5 has an ( F 4 , F 4 ) -partition.

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