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: "lexicographic probability conditional probability and nonstandard probability"
  Abstract: The relationship between Popper spaces (conditional probability spaces that satisfy some regularity conditions), lexicographic probability systems (LPS's), and nonstandard probability spaces (NPS's) is considered. If countable additivity is assumed, Popper spaces and a subclass of LPS's are equivalent; without the assumption of countable additivity, the equivalence no longer holds. If the state space is finite, LPS's are equivalent to NPS's. However, if the state space is infinite, NPS's are shown to be more general than LPS's.

Connected through hyperedge HE-1 (induced by source paper "a conceptually well founded characterization of iterated admissibility using an all i know operator"):
  with members:
    - "a logical characterization of iterated admissibility"
    - "multi agent only knowing"

Connected through hyperedge HE-2 (induced by source paper "lexicographic choice functions"):
  with members:
    - "desirability and the birth of incomplete preferences"
    - "irrelevant and independent natural extension for sets of desirable gambles"

Connected through hyperedge HE-3 (induced by source paper "characterizing solution concepts in terms of common knowledge of rationality"):
  with members:
    - "regret minimizing equilibria and mechanisms for games with strict type uncertainty"
    - "a logical characterization of iterated admissibility"
    - "characterizing solution concepts in games using knowledge based programs"

Connected through hyperedge HE-4 (induced by source paper "when is an example a counterexample"):
  with members:
    - "what does a conditional knowledge base entail"
    - "belief revision a critique"

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)