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: "expressiveness of metric modalities for continuous time"
  Abstract: We prove a conjecture by A. Pnueli and strengthen it showing a sequence of#N#"counting modalities" none of which is expressible in the temporal logic#N#generated by the previous modalities, over the real line, or over the positive#N#reals. Moreover, there is no finite temporal logic that can express all of them#N#over the real line, so that no finite metric temporal logic is expressively#N#complete.

Connected through hyperedge HE-1 (induced by source paper "fo fo3 for linear orders with monotone binary relations"):
  with members:
    - "it is easy to be wise after the event communicating finite state machines capture first order logic with happened before"

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"
    - "on timed automata with input determined guards"
    - "alternating timed automata"
    - "the complexity of temporal logic over the reals"

Connected through hyperedge HE-3 (induced by source paper "revisiting timed logics with automata modalities"):
  with members:
    - "reachability in timed automata with diagonal constraints"
    - "buchi kamp theorems for 1 clock ata"
    - "making metric temporal logic rational"
    - "quantitative regular expressions for arrhythmia detection algorithms"
    - "metric temporal logic with counting"
    - "on mitl and alternating timed automata over infinite words"
    - "on the decidability and complexity of metric temporal logic over finite 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)