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: "cops and robbers game theory and zermelo s early results"
  Abstract: We provide a game theoretic framework for the game of cops and robbers (CR). Within this framework we study certain assumptions which underlie the concepts of optimal strategies and capture time. We also point out a connection of these concepts to early work by Zermelo and D. Konig. Finally, we discuss the relationship between CR and related pursuit games to reachability games.

Connected through hyperedge HE-1 (induced by source paper "a game of cops and robbers on graphs with periodic edge connectivity"):
  with members:
    - "an introduction to temporal graphs an algorithmic perspective"
    - "the role of visibility in pursuit evasion games"
    - "time varying graphs and dynamic networks"

Connected through hyperedge HE-2 (induced by source paper "selfish cops and passive robber part i qualitative games"):
  with members:
    - "simultaneously moving cops and robbers"
    - "the role of visibility in pursuit evasion games"
    - "cops and invisible robbers the cost of drunkenness"

Connected through hyperedge HE-3 (induced by source paper "simultaneously moving cops and robbers"):
  with members:
    - "the role of visibility in pursuit evasion games"
    - "cops and invisible robbers the cost of drunkenness"
    - "some remarks on cops and drunk robbers"

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)