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: "wreath products of forest algebras with applications to tree logics"
  Abstract: We use the recently developed theory of forest algebras to find algebraic#N#characterizations of the languages of unranked trees and forests definable in#N#various logics. These include the temporal logics CTL and EF, and first-order#N#logic over the ancestor relation. While the characterizations are in general#N#non-effective, we are able to use them to formulate necessary conditions for#N#definability and provide new proofs that a number of languages are not#N#definable in these logics.

Connected through hyperedge HE-1 (induced by source paper "first order tree to tree functions"):
  with members:
    - "regular combinators for string transformations"
    - "streaming tree transducers"
    - "mso definable string transductions and two way finite state transducers"

Connected through hyperedge HE-2 (induced by source paper "wreath products of distributive forest algebras"):
  with members:
    - "going higher in the first order quantifier alternation hierarchy on words"
    - "piecewise testable tree languages"
    - "an effective characterization of the alternation hierarchy in two variable logic"
    - "a decidable characterization of locally testable tree languages"
    - "tree languages defined in first order logic with one quantifier alternation"

Connected through hyperedge HE-3 (induced by source paper "deciding definability in fo2 h v on trees"):
  with members:
    - "piecewise testable tree languages"
    - "a decidable characterization of locally testable tree languages"
    - "tree languages defined in first order logic with one quantifier alternation"
    - "two way unary temporal logic over trees"

Connected through hyperedge HE-4 (induced by source paper "ef ex forest algebras"):
  with members:
    - "piecewise testable tree languages"

Connected through hyperedge HE-5 (induced by source paper "piecewise testable tree languages"):
  with members:
    - "two way unary temporal logic over trees"

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)