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: "hennessy milner logic with greatest fixed points as a complete behavioural specification theory"
  Abstract: There are two fundamentally different approaches to specifying and verifying properties of systems. The logical approach makes use of specifications given as formulae of temporal or modal logics and relies on efficient model checking algorithms; the behavioural approach exploits various equivalence or refinement checking methods, provided the specifications are given in the same formalism as implementations. #R##N#In this paper we provide translations between the logical formalism of Hennessy-Milner logic with greatest fixed points and the behavioural formalism of disjunctive modal transition systems. We also introduce a new operation of quotient for the above equivalent formalisms, which is adjoint to structural composition and allows synthesis of missing specifications from partial implementations. This is a substantial generalisation of the quotient for deterministic modal transition systems defined in earlier papers.

Connected through hyperedge HE-1 (induced by source paper "synthesis of coordination programs from linear temporal logic"):
  with members:
    - "bosy an experimentation framework for bounded synthesis"
    - "encodings of bounded synthesis"
    - "ltl to b uchi automata translation fast and more deterministic"
    - "algorithms for omega regular games with imperfect information"

Connected through hyperedge HE-2 (induced by source paper "a linear time branching time spectrum of behavioral specification theories"):
  with members:
    - "structural refinement for the modal nu calculus"
    - "weighted modal transition systems"

Connected through hyperedge HE-3 (induced by source paper "compositionality for quantitative specifications"):
  with members:
    - "refinement and difference for probabilistic automata"
    - "structural refinement for the modal nu calculus"
    - "probabilistic modal mu calculus with independent product"
    - "a robust specification theory for modal event clock automata"
    - "weighted modal transition systems"
    - "a parametric counterexample refinement approach for robust timed specifications"

Connected through hyperedge HE-4 (induced by source paper "quotient of acceptance specifications under reachability constraints"):
  with members:
    - "modal interface automata"
    - "weighted modal transition systems"

Connected through hyperedge HE-5 (induced by source paper "on refinements of boolean and parametric modal transition systems"):
  with members:
    - "graphical representation of covariant contravariant modal formulae"

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)