Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Graph and Union of Graphs Compositions   Knopfmacher et all [1] was introduced the graph compositions` notion. In this
note we add to these a new construction of tree-like graphs where nodes are
graphs themselves. The first examples of these tree-like compositions, a
corresponding theorem and resulting conclusions are provided.

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The categories of this paper are: patt-sol
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The categories of this paper are: chao-dyn
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The categories of this paper are: econ
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The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
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The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
7
The categories of this paper are: hep-th
33
The categories of this paper are: plasm-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: astro-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-bio
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The categories of this paper are: eess
3
The categories of this paper are: physics