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: "cartesian closed 2 categories and permutation equivalence in higher order rewriting"
  Abstract: We propose a semantics for permutation equivalence in higher-order rewriting. This semantics takes place in cartesian closed 2-categories, and is proved sound and complete.

Connected through hyperedge HE-1 (induced by source paper "reduction monads and their signatures"):
  with members:
    - "modular specification of monads through higher order presentations"
    - "signatures and models for syntax and operational semantics in the presence of variable binding"
    - "high level signatures and initial semantics"
    - "lecture notes on the lambda calculus"
    - "modules over relative monads for syntax and semantics"
    - "monads need not be endofunctors"
    - "second order algebraic theories"
    - "a theory of explicit substitutions with safe and full composition"

Connected through hyperedge HE-2 (induced by source paper "signatures and models for syntax and operational semantics in the presence of variable binding"):
  with members:
    - "high level signatures and initial semantics"
    - "lecture notes on the lambda calculus"
    - "monads need not be endofunctors"
    - "second order algebraic theories"
    - "initial semantics for strengthened signatures"
    - "closed nominal rewriting and efficiently computable nominal algebra equality"
    - "a theory of explicit substitutions with safe and full composition"

Connected through hyperedge HE-3 (induced by source paper "a type theory for cartesian closed bicategories"):
  with members:
    - "a categorical treatment of ornaments"

Connected through hyperedge HE-4 (induced by source paper "representing operational semantics with enriched lawvere theories"):
  with members:
    - "name free combinators for concurrency"
    - "higher category models of the pi calculus"

Connected through hyperedge HE-5 (induced by source paper "modules over relative monads for syntax and semantics"):
  with members:
    - "monads need not be endofunctors"
    - "extended initiality for typed abstract syntax"
    - "initial semantics for higher order typed syntax in coq"
    - "modules over monads and linearity"

Connected through hyperedge HE-6 (induced by source paper "full abstraction for fair testing in ccs"):
  with members:
    - "initiality for typed syntax and semantics"
    - "innocent strategies as presheaves and interactive equivalences for ccs"
    - "explicit fairness in testing semantics"

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)