The 6-girth-thickness of the complete graph

The $g$-girth-thickness $θ(g,G)$ of a graph $G$ is the minimum number of planar subgraphs of girth at least $g$ whose union is $G$. In this paper, we determine the $6$-girth-thickness $θ(6,K_n)$ of the complete graph $K_n$ in almost all cases. And also, we calculate by computer the missing value of $θ(4,K_n)$.

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