Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Note on modified Veselov-Novikov Hierarchy   Because of its relevance to lower-dimensional conformal geometry, known as a
generalized Weierstrass inducing, the modified Veselov-Novikov (mVN) hierarchy
attracts renewed interest recently. It has been shown explicitly in the
literature that an extrinsic string action \`a la Polyakov (Willmore
functional) is invariant under deformations associated to the first member of
the mVN hierarchy. In this note we go one step further and show the explicit
invariance of the functional under deformations associated to all higher
members of the hierarchy.

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The categories of this paper are: chao-dyn
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The categories of this paper are: patt-sol
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The categories of this paper are: dg-ga
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The categories of this paper are: chem-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: adap-org
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The categories of this paper are: q-alg
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The categories of this paper are: hep-ex
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The categories of this paper are: hep-ph
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The categories of this paper are: cs
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The categories of this paper are: nlin
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The categories of this paper are: supr-con
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The categories of this paper are: gr-qc
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The categories of this paper are: quant-ph
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The categories of this paper are: econ
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The categories of this paper are: q-bio