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: "applying cegar to the petri net state equation"
  Abstract: We propose a reachability verification technique that combines the Petri net#N#state equation (a linear algebraic overapproximation of the set of reachable#N#states) with the concept of counterexample guided abstraction refinement. In#N#essence, we replace the search through the set of reachable states by a search#N#through the space of solutions of the state equation. We demonstrate the#N#excellent performance of the technique on several real-world examples. The#N#technique is particularly useful in those cases where the reachability query#N#yields a negative result: While state space based techniques need to fully#N#expand the state space in this case, our technique often terminates promptly.#N#In addition, we can derive some diagnostic information in case of#N#unreachability while state space methods can only provide witness paths in the#N#case of reachability.

Connected through hyperedge HE-1 (induced by source paper "biologically inspired process calculi petri nets and membrane computing"):
  with members:
    - "stochastic calculus of wrapped compartments"
    - "hybrid calculus of wrapped compartments"
    - "edge and node disjoint paths in p systems"
    - "an abstraction theory for qualitative models of biological systems"
    - "on the convergence of population protocols when population goes to infinity"

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)