Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Hyper-Zagreb Index of Trees and Unicyclic Graphs   Applications in chemistry motivated mathematicians to define different
topological indices for different types of graphs. The Hyper-Zagreb index (HM)
is an important tool as it integrates the first and the second Zagreb indices.
In this paper, we characterize the trees and unicyclic graphs with the first
four and first eight greatest HM-value, respectively.

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The categories of this paper are: cs
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The categories of this paper are: alg-geom
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The categories of this paper are: mtrl-th
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The categories of this paper are: patt-sol
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The categories of this paper are: gr-qc
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The categories of this paper are: astro-ph
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The categories of this paper are: nlin
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-lat
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The categories of this paper are: supr-con
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
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The categories of this paper are: comp-gas
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The categories of this paper are: bayes-an
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The categories of this paper are: solv-int
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The categories of this paper are: funct-an