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: "algebraic recognizability of languages"
  Abstract: Recognizable languages of finite words are part of every computer science cursus, and they are routinely described as a cornerstone for applications and for theory. We would like to briefly explore why that is, and how this word-related notion extends to more complex models, such as those developed for modeling distributed or timed behaviors.

Connected through hyperedge HE-1 (induced by source paper "on varieties of automata enriched with an algebraic structure extended abstract"):
  with members:
    - "separating regular languages with first order logic"
    - "syntactic complexity of r and j trivial regular languages"
    - "on logical hierarchies withinfoâ definable languages"
    - "an introduction to finite automata and their connection to logic"

Connected through hyperedge HE-2 (induced by source paper "languages of dot depth one over infinite words"):
  with members:
    - "first order fragments with successor over infinite words"
    - "fragments of first order logic over infinite words"
    - "logic meets algebra the case of regular languages"
    - "algebraic characterization of logically defined tree languages"

Connected through hyperedge HE-3 (induced by source paper "fragments of first order logic over infinite words"):
  with members:
    - "piecewise testable tree languages"
    - "tree languages defined in first order logic with one quantifier alternation"
    - "two way unary temporal logic over trees"
    - "logic meets algebra the case of regular languages"

Connected through hyperedge HE-4 (induced by source paper "algebraic characterization of logically defined tree languages"):
  with members:
    - "piecewise testable tree languages"
    - "tree languages defined in first order logic with one quantifier alternation"
    - "two way unary temporal logic over trees"
    - "algebraic recognizability of regular tree languages"

Connected through hyperedge HE-5 (induced by source paper "logic meets algebra the case of regular languages"):
  with members:
    - "algebraic recognizability of regular tree languages"
    - "arithmetic first order logic and counting quantifiers"
    - "the descriptive complexity approach to logcfl"

Connected through hyperedge HE-6 (induced by source paper "algebraic recognizability of regular tree languages"):
  with members:
    - "the recognizability of sets of graphs is a robust property"

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)