Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Interlacement and Activities in Delta-Matroids   We generalize theories of graph, matroid, and ribbon-graph activities to
delta-matroids. As a result, we obtain an activities based feasible-set
expansion for a transition polynomial of delta-matroids defined by Brijder and
Hoogeboom. This result yields feasible-set expansions for the two-variable
Bollob\'{a}s-Riordan and interlace polynomials of a delta-matroid. In the
former case, the expansion obtained directly generalizes the activities
expansions of the Tutte polynomial of graphs and matroids.

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The categories of this paper are: alg-geom
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The categories of this paper are: supr-con
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The categories of this paper are: plasm-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: mtrl-th
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The categories of this paper are: quant-ph
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The categories of this paper are: adap-org
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The categories of this paper are: chao-dyn
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The categories of this paper are: ao-sci
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The categories of this paper are: solv-int
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The categories of this paper are: hep-ex
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The categories of this paper are: econ
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The categories of this paper are: hep-lat
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The categories of this paper are: astro-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: nucl-ex