Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Symmetries and criticality of generalised van der Waals models   We consider a family of thermodynamic models such that the energy density can
be expressed as an asymptotic expansion in the scale formal parameter and whose
terms are suitable functions of the volume density. We examine the possibility
to construct solutions for the Maxwell thermodynamic relations relying on their
symmetry properties and deduce the critical properties implied in terms of the
the dynamics of coexistence curves in the space of thermodynamic variables.

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The categories of this paper are: astro-ph
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The categories of this paper are: q-bio
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The categories of this paper are: hep-lat
2
The categories of this paper are: math
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The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
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The categories of this paper are: atom-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: physics
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The categories of this paper are: quant-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-ex