Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Another note on focus-focus singularities   We show a natural relation between the monodromy formula for focus-focus
singularities of integrable Hamiltonian systems and a formula of
Duistermaat-Heckman, and extend the main results of our previous note on
focus-focus singularities ($\bbS^1$-action, monodromy, and topological
classification) to the degenerate case. We also consider the non-Hamiltonian
case, local normal forms, etc.

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The categories of this paper are: q-bio
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The categories of this paper are: solv-int
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The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
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The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
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The categories of this paper are: nucl-ex
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The categories of this paper are: econ
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The categories of this paper are: physics
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The categories of this paper are: chem-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: stat
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The categories of this paper are: adap-org
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The categories of this paper are: dg-ga
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The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-th