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: "alternating timed automata"
  Abstract: A notion of alternating timed automata is proposed. It is shown that such automata with only one clock have decidable emptiness problem over finite words. This gives a new class of timed languages which is closed under boolean operations and which has an effective presentation. We prove that the complexity of the emptiness problem for alternating timed automata with one clock is non-primitive recursive. The proof gives also the same lower bound for the universality problem for nondeterministic timed automata with one clock. We investigate extension of the model with epsilon-transitions and prove that emptiness is undecidable. Over infinite words, we show undecidability of the universality problem.

Connected through hyperedge HE-1 (induced by source paper "timed basic parallel processes"):
  with members:
    - "effective definability of the reachability relation in timed automata"
    - "decidability of timed communicating automata"
    - "universal safety for timed petri nets is pspace complete"
    - "reachability in two clock timed automata is pspace complete"
    - "a faster algorithm for solving one clock priced timed games"
    - "reachability analysis of communicating pushdown systems"
    - "reachability of communicating timed processes"
    - "reachability time games on timed automata"

Connected through hyperedge HE-2 (induced by source paper "on the expressiveness and monitoring of metric temporal logic"):
  with members:
    - "on mitl and alternating timed automata over infinite words"
    - "on the complexity of temporal logic path checking"
    - "expressive completeness of metric temporal logic"
    - "when is metric temporal logic expressively complete"
    - "on expressive powers of timed logics comparing boundedness non punctuality and deterministic freezing"
    - "expressiveness of metric modalities for continuous time"
    - "on timed automata with input determined guards"
    - "the complexity of temporal logic over the reals"

Connected through hyperedge HE-3 (induced by source paper "buchi kamp theorems for 1 clock ata"):
  with members:
    - "making metric temporal logic rational"
    - "metric temporal logic with counting"

Connected through hyperedge HE-4 (induced by source paper "complexity hierarchies beyond elementary"):
  with members:
    - "relating timed and register automata"
    - "demystifying reachability in vector addition systems"
    - "nonelementary complexities for branching vass mell and extensions"
    - "on freeze ltl with ordered attributes"
    - "trace inclusion for one counter nets revisited"
    - "the power of priority channel systems"
    - "the parametric ordinal recursive complexity of post embedding problems"
    - "graph logics with rational relations"

Connected through hyperedge HE-5 (induced by source paper "relating timed and register automata"):
  with members:
    - "weak alternating timed automata"
    - "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"

Connected through hyperedge HE-6 (induced by source paper "on reachability for unidirectional channel systems extended with regular tests"):
  with members:
    - "complexity hierarchies beyond elementary"
    - "generalized post embedding problems"
    - "the parametric ordinal recursive complexity of post embedding problems"
    - "graph logics with rational relations"
    - "the power of well structured systems"
    - "reachability analysis of communicating pushdown systems"
    - "cutting through regular post embedding problems"
    - "reachability of communicating timed processes"

Connected through hyperedge HE-7 (induced by source paper "reachability analysis of first order definable pushdown systems"):
  with members:
    - "timed pushdown automata revisited"
    - "automata theory in nominal sets"
    - "saturation algorithms for model checking pushdown systems"
    - "reachability problem for weak multi pushdown automata"
    - "model checking of ordered multi pushdown automata"
    - "ltl with the freeze quantifier and register automata"

Connected through hyperedge HE-8 (induced by source paper "generalized post embedding problems"):
  with members:
    - "complexity hierarchies beyond elementary"
    - "the parametric ordinal recursive complexity of post embedding problems"
    - "graph logics with rational relations"
    - "cutting through regular post embedding problems"
    - "multiply recursive upper bounds with higman s lemma"

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)