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- W4301514113 abstract "Let $k$ be a positive integer and let $D$ be a digraph. A path partition $sP$ of $D$ is a set of vertex-disjoint paths which covers $V(D)$. Its $k$-norm is defined as $sum_{P in sP} Min{|V(P)|, k}$. A path partition is $k$-optimal if its $k$-norm is minimum among all path partitions of $D$. A partial $k$-coloring is a collection of $k$ disjoint stable sets. A partial $k$-coloring $sC$ is orthogonal to a path partition $sP$ if each path $P in sP$ meets $min{|P|,k}$ distinct sets of $sC$. Berge (1982) conjectured that every $k$-optimal path partition of $D$ has a partial $k$-coloring orthogonal to it. A (path) $k$-pack of $D$ is a collection of at most $k$ vertex-disjoint paths in $D$. Its weight is the number of vertices it covers. A $k$-pack is optimal if its weight is maximum among all $k$-packs of $D$. A coloring of $D$ is a partition of $V(D)$ into stable sets. A $k$-pack $sP$ is orthogonal to a coloring $sC$ if each set $C in sC$ meets $Min{|C|, k}$ paths of $sP$. Aharoni, Hartman and Hoffman (1985) conjectured that every optimal $k$-pack of $D$ has a coloring orthogonal to it. A digraph $D$ is semicomplete if every pair of distinct vertices of $D$ is adjacent. A digraph $D$ is locally in-semicomplete if, for every vertex $v in V(D)$, the in-neighborhood of $v$ induces a semicomplete digraph. Locally out-semicomplete digraphs are defined similarly. In this paper, we prove Berge's and Aharoni-Hartman-Hoffman's Conjectures for locally in/out-semicomplete digraphs." @default.
- W4301514113 created "2022-10-05" @default.
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- W4301514113 date "2017-08-22" @default.
- W4301514113 modified "2023-10-09" @default.
- W4301514113 title "Berge's Conjecture and Aharoni-Hartman-Hoffman's Conjecture for locally in-semicomplete digraphs" @default.
- W4301514113 doi "https://doi.org/10.48550/arxiv.1708.06691" @default.
- W4301514113 hasPublicationYear "2017" @default.
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