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: "weak alternating timed automata"
  Abstract: Alternating timed automata on infinite words are considered. The main result#N#is a characterization of acceptance conditions for which the emptiness problem#N#for these automata is decidable. This result implies new decidability results#N#for fragments of timed temporal logics. It is also shown that, unlike for MITL,#N#the characterisation remains the same even if no punctual constraints are#N#allowed.

Connected through hyperedge HE-1 (induced by source paper "relating timed and register automata"):
  with members:
    - "ackermannian and primitive recursive bounds with dickson s lemma"
    - "safety alternating automata on data words"
    - "on termination for faulty channel machines"
    - "ltl with the freeze quantifier and register automata"
    - "alternating timed automata"

Connected through hyperedge HE-2 (induced by source paper "on mitl and alternating timed automata over infinite words"):
  with members:
    - "on mitl and alternating timed automata"
    - "on the decidability and complexity of metric temporal logic over finite words"

Connected through hyperedge HE-3 (induced by source paper "on expressive powers of timed logics comparing boundedness non punctuality and deterministic freezing"):
  with members:
    - "rankers over infinite words"

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.LO(Logic in Computer Science)