Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Worst-case efficient dominating sets in digraphs   Let $1\le n\in\Z$. {\it Worst-case efficient dominating sets in digraphs} are
conceived so that their presence in certain strong digraphs $\vec{ST}_n$
corresponds to that of efficient dominating sets in star graphs $ST_n$: The
fact that the star graphs $ST_n$ form a so-called dense segmental neighborly
E-chain is reflected in a corresponding fact for the digraphs $\vec{ST}_n$.
Related chains of graphs and open problems are presented as well.

18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
16
The categories of this paper are: stat
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The categories of this paper are: eess
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The categories of this paper are: bayes-an
4
The categories of this paper are: cond-mat
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The categories of this paper are: solv-int
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The categories of this paper are: q-alg
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas