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: "the complexity of clausal fragments of ltl"
  Abstract: We introduce and investigate a number of fragments of propo- sitional temporal logic LTL over the flow of time (Z, <). The fragments are defined in terms of the available temporal operators and the structure of the clausal normal form of the temporal formulas. We determine the computational complexity of the satisfiability problem for each of the fragments, which ranges from NLogSpace to PTime, NP and PSpace.

Connected through hyperedge HE-1 (induced by source paper "horn fragments of the halpern shoham interval temporal logic"):
  with members:
    - "undecidable propositional bimodal logics and one variable first order linear temporal logics with counting"
    - "a cookbook for temporal conceptual data modelling with description logics"
    - "interval temporal logics over strongly discrete linear orders the complete picture"
    - "two variable logic with two order relations"
    - "monodic temporal resolution"

Connected through hyperedge HE-2 (induced by source paper "querying log data with metric temporal logic"):
  with members:
    - "horn fragments of the halpern shoham interval temporal logic"
    - "on the decidability and complexity of some fragments of metric temporal logic"
    - "a cookbook for temporal conceptual data modelling with description logics"
    - "pspace reasoning for graded modal logics"

Connected through hyperedge HE-3 (induced by source paper "strong backdoors for linear temporal logic"):
  with members:
    - "ltl fragments are hard for standard parameterisations"
    - "backdoors to normality for disjunctive logic programs"
    - "satisfiability of acyclic and almost acyclic cnf formulas"
    - "backdoors to satisfaction"
    - "backdoors to tractable answer set programming"
    - "the complexity of generalized satisfiability for linear temporal logic"
    - "clausal temporal resolution"

Connected through hyperedge HE-4 (induced by source paper "on sub propositional fragments of modal logic"):
  with members:
    - "horn fragments of the halpern shoham interval temporal logic"
    - "a cookbook for temporal conceptual data modelling with description logics"

Connected through hyperedge HE-5 (induced by source paper "on the expressive power of sub propositional fragments of modal logic"):
  with members:
    - "a cookbook for temporal conceptual data modelling with description logics"
    - "a pspace complete first order fragment of computability logic"

Connected through hyperedge HE-6 (induced by source paper "logic of temporal attribute implications"):
  with members:
    - "exploiting functional dependencies in qualitative probabilistic reasoning"

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)