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: "decidability results for the boundedness problem"
  Abstract: We prove decidability of the boundedness problem for monadic least#N#fixed-point recursion based on positive monadic second-order (MSO) formulae#N#over trees. Given an MSO-formula phi(X,x) that is positive in X, it is#N#decidable whether the fixed-point recursion based on phi is spurious over the#N#class of all trees in the sense that there is some uniform finite bound for the#N#number of iterations phi takes to reach its least fixed point, uniformly across#N#all trees. We also identify the exact complexity of this problem. The proof#N#uses automata-theoretic techniques. This key result extends, by means of#N#model-theoretic interpretations, to show decidability of the boundedness#N#problem for MSO and guarded second-order logic (GSO) over the classes of#N#structures of fixed finite tree-width. Further model-theoretic transfer#N#arguments allow us to derive major known decidability results for boundedness#N#for fragments of first-order logic as well as new ones.

Connected through hyperedge HE-1 (induced by source paper "a more general theory of static approximations for conjunctive queries"):
  with members:
    - "constraint solving via fractional edge covers"
    - "semantic acyclicity under constraints"
    - "general and fractional hypertree decompositions hard and easy cases"
    - "querying the guarded fragment"
    - "beyond hypertree width decomposition methods without decompositions"
    - "hypertree decompositions and tractable queries"

Connected through hyperedge HE-2 (induced by source paper "definability and interpolation within decidable fixpoint logics"):
  with members:
    - "semantic acyclicity under constraints"
    - "querying the guarded fragment"

Connected through hyperedge HE-3 (induced by source paper "trading bounds for memory in games with counters"):
  with members:
    - "regular cost functions part i logic and algebra over words"

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)