We improve the upper bound on superbridge index $sb [K]$ $sb [K]$ in terms of bridge index $b [K]$ $b [K]$ from $sb [K] \leq 5 b [K] - 3$ $sb [K] \leq 5 b [K] - 3$ to $sb [K] \leq 3 b [K] - 1$ $sb [K] \leq 3 b [K] - 1$ .

Keywords:

AMSC: 57M25, 57M27

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