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: "undecidability of two dimensional robot games"
  Abstract: Robot game is a two-player vector addition game played on the integer lattice $\mathbb{Z}^n$. Both players have sets of vectors and in each turn the vector chosen by a player is added to the current configuration vector of the game. One of the players, called Eve, tries to play the game from the initial configuration to the origin while the other player, Adam, tries to avoid the origin. The problem is to decide whether or not Eve has a winning strategy. In this paper we prove undecidability of the robot game in dimension two answering the question formulated by Doyen and Rabinovich in 2011 and closing the gap between undecidable and decidable cases.

Connected through hyperedge HE-1 (induced by source paper "bounding average energy games"):
  with members:
    - "limit your consumption finding bounds in average energy games"
    - "average energy games"
    - "fixed dimensional energy games are in pseudo polynomial time"
    - "reachability in succinct one counter games"
    - "reachability in two clock timed automata is pspace complete"
    - "looking at mean payoff and total payoff through windows"
    - "automated synthesis of reliable and efficient systems through game theory a case study"
    - "the complexity of multi mean payoff and multi energy games"

Connected through hyperedge HE-2 (induced by source paper "weighted automata on infinite words in the context of attacker defender games"):
  with members:
    - "on the complexity of counter reachability games"
    - "the complexity of robot games on the integer line"
    - "infinite state games with finitary conditions"
    - "reachability games on extended vector addition systems with states"
    - "braid group cryptography"

Connected through hyperedge HE-3 (induced by source paper "hyperplane separation technique for multidimensional mean payoff games"):
  with members:
    - "fixed dimensional energy games are in pseudo polynomial time"
    - "synthesis from ltl specifications with mean payoff objectives"
    - "efficient controller synthesis for consumption games with multiple resource types"
    - "the complexity of multi mean payoff and multi energy games"
    - "mean payoff pushdown games"
    - "the complexity of mean payoff automaton expression"
    - "qualitative reachability in stochastic bpa games"
    - "generalized mean payoff and energy games"

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.GT(Computer Science and Game Theory)