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Planar Tur\'an number for balanced double stars
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abstract
Planar Tur\'an number, denoted by $ex_{\mathcal{P}}(n,H)$, is the maximum number of edges in an $n$-vertex planar graph which does not contain $H$ as a subgraph. Ghosh, Gy\H{o}ri, Paulos and Xiao initiated the topic of the planar Tur\'an number for double stars. For balanced double star, $S_{3,3}$ is the only remaining graph need to be considered. In this paper, we give the exact value of $ex_{\mathcal{P}}(n,S_{3,3})$, forcing the planar Tur\'an number for all balanced double stars completely determined.
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Planar Tur\'an number of quasi-double stars
For quasi-double stars W_{h,k} with 1≤h≤2≤k≤5, the paper proves planar Turán bounds of 3(h+k)/(h+k+2)n for h+k≤5, and two-sided bounds of 5/2 n and 17/6 n for larger cases.
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