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: "isomorphism testing for graphs of bounded rank width"
  Abstract: We give an algorithm that, for every fixed k, decides isomorphism of graphs of rank width at most k in polynomial time. As the clique width of a graph is bounded in terms of its rank width, we also obtain a polynomial time isomorphism test for graph classes of bounded clique width.

Connected through hyperedge HE-1 (induced by source paper "hypergraph isomorphism for groups with restricted composition factors"):
  with members:
    - "graph isomorphism in quasipolynomial time parameterized by treewidth"
    - "an improved isomorphism test for bounded tree width graphs"
    - "a faster isomorphism test for graphs of small degree"
    - "a unifying method for the design of algorithms canonizing combinatorial objects"
    - "graph isomorphism for unit square graphs"
    - "graph isomorphism in quasipolynomial time"
    - "graph isomorphism for bounded genus graphs in linear time"
    - "tight lower and upper bounds for the complexity of canonical colour refinement"

Connected through hyperedge HE-2 (induced by source paper "canonisation and definability for graphs of bounded rank width"):
  with members:
    - "an improved isomorphism test for bounded tree width graphs"
    - "definable decompositions for graphs of bounded linear cliquewidth"
    - "the weisfeiler leman dimension of planar graphs is at most 3"
    - "computing with tangles"
    - "fixed parameter tractable canonization and isomorphism test for graphs of bounded treewidth"
    - "structure theorem and isomorphism test for graphs with excluded topological subgraphs"
    - "capturing polynomial time on interval graphs"

Connected through hyperedge HE-3 (induced by source paper "graph isomorphism for h_1 h_2 free graphs an almost complete dichotomy"):
  with members:
    - "canonisation and definability for graphs of bounded rank width"
    - "an improved isomorphism test for bounded tree width graphs"
    - "a faster isomorphism test for graphs of small degree"
    - "clique width for graph classes closed under complementation"
    - "graph isomorphism for unit square graphs"
    - "induced minor free graphs isomorphism and clique width"
    - "bounding the clique width of h free chordal graphs"
    - "colouring diamond free graphs"

Connected through hyperedge HE-4 (induced by source paper "a unifying method for the design of algorithms canonizing combinatorial objects"):
  with members:
    - "an improved isomorphism test for bounded tree width graphs"
    - "a faster isomorphism test for graphs of small degree"
    - "minimum circuit size graph isomorphism and related problems"
    - "polynomial time isomorphism test of groups that are tame extensions"
    - "beating the generator enumeration bound for p group isomorphism"
    - "algorithms for group isomorphism via group extensions and cohomology"

Connected through hyperedge HE-5 (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"
    - "reduction techniques for graph isomorphism in the context of width parameters"
    - "structure theorem and isomorphism test for graphs with excluded topological subgraphs"

Connected through hyperedge HE-6 (induced by source paper "a complexity theory for labeling schemes"):
  with members:
    - "an optimal ancestry labeling scheme with applications to xml trees and universal posets"
    - "on the implicit graph conjecture"
    - "linear time algorithms for finding a dominating set of fixed size in degenerated graphs"

Connected through hyperedge HE-7 (induced by source paper "clique width for graph classes closed under complementation"):
  with members:
    - "the behavior of clique width under graph operations and graph transformations"
    - "hereditary graph classes when the complexities of colouring and clique cover coincide"
    - "bounding the clique width of h free chordal graphs"
    - "colouring diamond free graphs"
    - "bounding the clique width of h free split graphs"
    - "bounding clique width via perfect graphs"
    - "clique width of graph classes defined by two forbidden induced subgraphs"
    - "classifying the clique width of h free bipartite graphs"

Connected through hyperedge HE-8 (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"

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)