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- W3201979188 abstract "A digraph $G$ is emph{$k$-geodetic} if for any (not necessarily distinct) vertices $u,v$ there is at most one directed walk from $u$ to $v$ with length not exceeding $k$. The order of a $k$-geodetic digraph with minimum out-degree $d$ is bounded below by the directed Moore bound $M(d,k) = 1+d+d^2+dots +d^k$. The Moore bound can be met only in the trivial cases $d = 1$ and $k = 1$, so it is of interest to look for $k$-geodetic digraphs with out-degree $d$ and smallest possible order $M(d,k)+epsilon $, where $epsilon $ is the emph{excess} of the digraph. Miller, Miret and Sillasen recently ruled out the existence of digraphs with excess one for $k = 3,4$ and $d geq 2$ and for $k = 2$ and $d geq 8$. We conjecture that there are no digraphs with excess one for $d,k geq 2$ and in this paper we investigate the structure of minimal counterexamples to this conjecture. We severely constrain the possible structures of the outlier function and prove the non-existence of certain digraphs with degree three and excess one, as well closing the open cases $k = 2$ and $d = 3,4,5,6,7$ left by the analysis of Miller et al. We further show that there are no involutary digraphs with excess one, i.e. the outlier function of any such digraph must contain a cycle of length $geq 3$." @default.
- W3201979188 created "2021-10-11" @default.
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- W3201979188 date "2021-09-29" @default.
- W3201979188 modified "2023-09-27" @default.
- W3201979188 title "The structure of digraphs with excess one" @default.
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