Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Maximal diameter theorem for directed graphs of positive Ricci curvature   In a previous work, the authors have introduced a Lin-Lu-Yau type Ricci
curvature for directed graphs, and obtained a diameter comparison of
Bonnet-Myers type. In this paper, we investigate rigidity properties for the
equality case, and conclude a maximal diameter theorem of Cheng type.

15
The categories of this paper are: nucl-ex
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The categories of this paper are: nucl-th
29
The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
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The categories of this paper are: comp-gas
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The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
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The categories of this paper are: eess