human: Given a node-centered hypergraph: <hypergraph>, where nodes represent papers and hyperedges represent sets of papers co-cited by a source paper.

Details of the hypergraph:
Center node: "reduction techniques for graph isomorphism in the context of width parameters"
  Abstract: We study the parameterized complexity of the graph isomorphism problem when parameterized by width parameters related to tree decompositions. We apply the following technique to obtain fixed-parameter tractability for such parameters. We first compute an isomorphism invariant set of potential bags for a decomposition and then apply a restricted version of the Weisfeiler-Lehman algorithm to solve isomorphism. With this we show fixed-parameter tractability for several parameters and provide a unified explanation for various isomorphism results concerned with parameters related to tree decompositions. As a possibly first step towards intractability results for parameterized graph isomorphism we develop an fpt Turing-reduction from strong tree width to the a priori unrelated parameter maximum degree.

Connected through hyperedge HE-1 (induced by source paper "an improved isomorphism test for bounded tree width graphs"):
  with members:
    - "towards faster isomorphism tests for bounded degree graphs"
    - "graph isomorphism for unit square graphs"
    - "canonizing graphs of bounded tree width in logspace"
    - "isomorphism testing for graphs of bounded rank width"
    - "structure theorem and isomorphism test for graphs with excluded topological subgraphs"

Connected through hyperedge HE-2 (induced by source paper "ranked enumeration of minimal triangulations"):
  with members:
    - "constraint solving via fractional edge covers"
    - "on distance d independent set and other problems in graphs with few minimal separators"
    - "flexible caching in trie joins"
    - "large induced subgraphs via triangulations and cmso"
    - "pure nash equilibria hard and easy games"
    - "hypertree decompositions and tractable queries"

Connected through hyperedge HE-3 (induced by source paper "benchmark graphs for practical graph isomorphism"):
  with members:
    - "an exponential lower bound for individualization refinement algorithms for graph isomorphism"
    - "practical graph isomorphism ii"
    - "conauto 2 0 fast isomorphism testing and automorphism group computation"

Connected through hyperedge HE-4 (induced by source paper "graph isomorphism restricted by lists"):
  with members:
    - "algorithmic aspects of regular graph covers"
    - "induced minor free graphs isomorphism and clique width"
    - "polynomial time algorithm for isomorphism of graphs with clique width at most three"
    - "canonizing graphs of bounded tree width in logspace"
    - "graph isomorphism in quasipolynomial time"
    - "graph isomorphism completeness for trapezoid graphs"
    - "graph isomorphism for bounded genus graphs in linear time"
    - "iv matching is strongly np hard"

Connected through hyperedge HE-5 (induced by source paper "induced minor free graphs isomorphism and clique width"):
  with members:
    - "graph isomorphism in quasipolynomial time"
    - "isomorphism testing for graphs of bounded rank width"
    - "clique width of graph classes defined by two forbidden induced subgraphs"
    - "classifying the clique width of h free bipartite graphs"
    - "towards an isomorphism dichotomy for hereditary graph classes"
    - "fixed parameter tractable canonization and isomorphism test for graphs of bounded treewidth"
    - "clique width and edge contraction"
    - "graph isomorphism for graph classes characterized by two forbidden induced subgraphs"

Connected through hyperedge HE-6 (induced by source paper "canonizing graphs of bounded tree width in logspace"):
  with members:
    - "fixed parameter tractable canonization and isomorphism test for graphs of bounded treewidth"
    - "restricted space algorithms for isomorphism on bounded treewidth graphs"
    - "testing graph isomorphism in parallel by playing a game"

Connected through hyperedge HE-7 (induced by source paper "fixed parameter tractable canonization and isomorphism test for graphs of bounded treewidth"):
  with members:
    - "minimum bisection is fixed parameter tractable"
    - "structure theorem and isomorphism test for graphs with excluded topological subgraphs"

Question: Please tell me which class the center node belongs to. The 40 classes are: cs.NA(Numerical Analysis), cs.MM(Multimedia), cs.LO(Logic in Computer Science), cs.CY(Computers and Society), cs.CR(Cryptography and Security), cs.DC(Distributed, Parallel, and Cluster Computing), cs.HC(Human-Computer Interaction), cs.CE(Computational Engineering, Finance, and Science), cs.NI(Networking and Internet Architecture), cs.CC(Computational Complexity), cs.AI(Artificial Intelligence), cs.MA(Multiagent Systems), cs.GL(General Literature), cs.NE(Neural and Evolutionary Computing), cs.SC(Symbolic Computation), cs.AR(Hardware Architecture), cs.CV(Computer Vision and Pattern Recognition), cs.GR(Graphics), cs.ET(Emerging Technologies), cs.SY(Systems and Control), cs.CG(Computational Geometry), cs.OH(Other Computer Science), cs.PL(Programming Languages), cs.SE(Software Engineering), cs.LG(Machine Learning), cs.SD(Sound), cs.SI(Social and Information Networks), cs.RO(Robotics), cs.IT(Information Theory), cs.PF(Performance), cs.CL(Computation and Language), cs.IR(Information Retrieval), cs.MS(Mathematical Software), cs.FL(Formal Languages and Automata Theory), cs.DS(Data Structures and Algorithms), cs.OS(Operating Systems), cs.GT(Computer Science and Game Theory), cs.DB(Databases), cs.DL(Digital Libraries), cs.DM(Discrete Mathematics). Directly output the class name.

gpt: cs.DM(Discrete Mathematics)