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: "the complexity of model checking higher order fixpoint logic"
  Abstract: Higher-Order Fixpoint Logic (HFL) is a hybrid of the simply typed λ-calculus and the modal μ-calculus. This makes it a highly expressive temporal logic that is capable of expressing various interes ...

Connected through hyperedge HE-1 (induced by source paper "a type based hfl model checking algorithm"):
  with members:
    - "higher order program verification via hfl model checking"
    - "a type directed negation elimination"
    - "model checking process equivalences"

Connected through hyperedge HE-2 (induced by source paper "higher order program verification via hfl model checking"):
  with members:
    - "relational semantics of linear logic and higher order model checking"
    - "a type directed negation elimination"
    - "finitary semantics of linear logic and higher order model checking"
    - "higher order program verification as satisfiability modulo theories with algebraic data types"
    - "model checking process equivalences"

Connected through hyperedge HE-3 (induced by source paper "lattices of logical fragments over words"):
  with members:
    - "structure theorem and strict alternation hierarchy for fo2 on words"
    - "logic meets algebra the case of regular languages"

Connected through hyperedge HE-4 (induced by source paper "model checking process equivalences"):
  with members:
    - "model checking the higher dimensional modal mu calculus"

Connected through hyperedge HE-5 (induced by source paper "on fo 2 quantifier alternation over words"):
  with members:
    - "structure theorem and strict alternation hierarchy for fo2 on words"
    - "logic meets algebra the case of regular languages"
    - "the succinctness of first order logic on linear orders"

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)