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: "fo model checking of interval graphs"
  Abstract: We study the computational complexity of the FO model checking#N#problem on interval graphs, i.e., intersection graphs of#N#intervals on the real line. The main positive result is that FO#N#model checking and successor-invariant FO model checking can be#N#solved in time O(n log n) for n-vertex interval graphs with#N#representations containing only intervals with lengths from a#N#prescribed finite set. We complement this result by showing#N#that the same is not true if the lengths are restricted to any#N#set that is dense in an open subset, e.g., in the set (1, 1 +#N#µ).

Connected through hyperedge HE-1 (induced by source paper "a new perspective on fo model checking of dense graph classes"):
  with members:
    - "model checking for successor invariant first order formulas on graph classes of bounded expansion"
    - "model checking existential logic on partially ordered sets"
    - "faster existential fo model checking on posets"
    - "deciding first order properties of locally tree decomposable structures"

Connected through hyperedge HE-2 (induced by source paper "model checking for successor invariant first order formulas on graph classes of bounded expansion"):
  with members:
    - "a new perspective on fo model checking of dense graph classes"
    - "the generalised colouring numbers on classes of bounded expansion"
    - "order invariance on decomposable structures"
    - "successor invariant first order logic on graphs with excluded topological subgraphs"
    - "deciding first order properties of nowhere dense graphs"
    - "structure theorem and isomorphism test for graphs with excluded topological subgraphs"
    - "lower bounds for the complexity of monadic second order logic"
    - "on brambles grid like minors and parameterized intractability of monadic second order logic"

Connected through hyperedge HE-3 (induced by source paper "fo model checking of geometric graphs"):
  with members:
    - "a new perspective on fo model checking of dense graph classes"
    - "fo model checking on posets of bounded width"
    - "model checking existential logic on partially ordered sets"
    - "faster existential fo model checking on posets"
    - "deciding first order properties of nowhere dense graphs"
    - "cleaning interval graphs"
    - "deciding first order properties of locally tree decomposable structures"

Connected through hyperedge HE-4 (induced by source paper "on the classes of interval graphs of limited nesting and count of lengths"):
  with members:
    - "extending partial representations of unit circular arc graphs"
    - "on the thinness and proper thinness of a graph"
    - "type based self stabilisation for computational fields"
    - "fo model checking on posets of bounded width"
    - "minimal and short representations of unit interval and unit circular arc graphs"
    - "bounded representations of interval and proper interval graphs"
    - "extending partial representations of interval graphs"
    - "extending partial representations of circle graphs"

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)