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: "pspace reasoning for graded modal logics"
  Abstract: We present a PSPACE algorithm that decides satisfiability of the graded modal logic Gr(K_R)---a natural extension of propositional modal logic K_R by counting expressions---which plays an important role in the area of knowledge representation. The algorithm employs a tableaux approach and is the first known algorithm which meets the lower bound for the complexity of the problem. Thus, we exactly fix the complexity of the problem and refute an ExpTime-hardness conjecture. We extend the results to the logic Gr(K_(R \cap I)), which augments Gr(K_R) with inverse relations and intersection of accessibility relations. This establishes a kind of ``theoretical benchmark'' that all algorithmic approaches can be measured against.

Connected through hyperedge HE-1 (induced by source paper "on the complexity of graded modal logics with converse"):
  with members:
    - "a note on the complexity of the satisfiability problem for graded modal logics"
    - "complexity of the guarded two variable fragment with counting quantifiers"
    - "deciding regular grammar logics with converse through first order logic"

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"
    - "the complexity of clausal fragments of ltl"
    - "a cookbook for temporal conceptual data modelling with description logics"

Connected through hyperedge HE-3 (induced by source paper "pspace bounds for rank 1 modal logics"):
  with members:
    - "characterizing the np pspace gap in the satisfiability problem for modal logic"

Connected through hyperedge HE-4 (induced by source paper "the craft of model making pspace bounds for non iterative modal logics"):
  with members:
    - "reasoning about expectation"
    - "a logic for reasoning about upper probabilities"
    - "a sequent calculus and a theorem prover for standard conditional logics"

Connected through hyperedge HE-5 (induced by source paper "complexity results and practical algorithms for logics in knowledge representation"):
  with members:
    - "practical reasoning for expressive description logics"
    - "the complexity of reasoning with cardinality restrictions and nominals in expressive description logics"
    - "reasoning with individuals for the description logic shiq"
    - "reasoning with axioms theory and pratice"
    - "a semantics and complete algorithm for subsumption in the classic description logic"
    - "decidable reasoning in terminological knowledge representation systems"

Connected through hyperedge HE-6 (induced by source paper "the complexity of reasoning with cardinality restrictions and nominals in expressive description logics"):
  with members:
    - "practical reasoning for expressive description logics"
    - "a semantics and complete algorithm for subsumption in the classic description 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)