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: "undecidability of first order modal and intuitionistic logics with two variables and one monadic predicate letter"
  Abstract: We prove that the positive fragment of first-order intuitionistic logic in the language with two individual variables and a single monadic predicate letter, without functional symbols, constants, and equality, is undecidable. This holds true regardless of whether we consider semantics with expanding or constant domains. We then generalise this result to intervals #N#                  #N#                    #N#                  #N#                  $$[\mathbf{QBL}, \mathbf{QKC}]$$#N#                  #N#                    #N#                  #N#                 and #N#                  #N#                    #N#                  #N#                  $$[\mathbf{QBL}, \mathbf{QFL}]$$#N#                  #N#                    #N#                  #N#                , where QKC is the logic of the weak law of the excluded middle and QBL and QFL are first-order counterparts of Visser’s basic and formal logics, respectively. We also show that, for most “natural” first-order modal logics, the two-variable fragment with a single monadic predicate letter, without functional symbols, constants, and equality, is undecidable, regardless of whether we consider semantics with expanding or constant domains. These include all sublogics of QKTB, QGL, and QGrz—among them, QK, QT, QKB, QD, QK4, and QS4.

Connected through hyperedge HE-1 (induced by source paper "complexity and expressivity of branching and alternating time temporal logics with finitely many variables"):
  with members:
    - "complexity and expressivity of propositional dynamic logics with finitely many variables"
    - "tableau based decision procedure for full coalitional multiagent temporal epistemic logic of linear tim"
    - "tableau based procedure for deciding satisfiability in the full coalitional multiagent epistemic logic"
    - "tableau based decision procedure for the multi agent epistemic logic with operators of common and distributed knowledge"
    - "the complexity of poor man s logic"

Connected through hyperedge HE-2 (induced by source paper "bundled fragments of first order modal logic un decidability"):
  with members:
    - "a new modal framework for epistemic logic"

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)