Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum Stress Focusing in Descriptive Chemistry   We show that several important concepts of descriptive chemistry, such as
atomic shells, bonding electron pairs and lone electron pairs, may be described
in terms of {\it quantum stress focusing}, i.e. the spontaneous formation of
high-pressure regions in an electron gas. This description subsumes previous
mathematical constructions, such as the Laplacian of the density and the
electron localization function, and provides a new tool for visualizing
chemical structure. We also show that the full stress tensor, defined as the
derivative of the energy with respect to a local deformation, can be easily
calculated from density functional theory.

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The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
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The categories of this paper are: q-fin
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The categories of this paper are: astro-ph
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin