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: "converging to the chase a tool for finite controllability"
  Abstract: We solve a problem, stated in [CGP10], showing that Sticky Datalog, defined in the cited paper as an element of the Datalog\pm project, has the finite controllability property. In order to do that, we develop a technique, which we believe can have further applications, of approximating Chase(D, T), for a database instance D and some sets of tuple generating dependencies T, by an infinite sequence of finite structures, all of them being models of T.

Connected through hyperedge HE-1 (induced by source paper "a new finitely controllable class of tuple generating dependencies the triangularly guarded class"):
  with members:
    - "existential rule languages with finite chase complexity and expressiveness"
    - "acyclicity notions for existential rules and their application to query answering in ontologies"

Connected through hyperedge HE-2 (induced by source paper "finite model reasoning over existential rules"):
  with members:
    - "knowledge spaces and the completeness of learning strategies"
    - "query rewriting and optimization for ontological databases"
    - "querying the guarded fragment"
    - "ontology based data access a study through disjunctive datalog csp and mmsnp"

Connected through hyperedge HE-3 (induced by source paper "semantic acyclicity under constraints"):
  with members:
    - "query rewriting and optimization for ontological databases"
    - "querying the guarded fragment"
    - "beyond hypertree width decomposition methods without decompositions"

Connected through hyperedge HE-4 (induced by source paper "red spider meets a rainworm conjunctive query finite determinacy is undecidable"):
  with members:
    - "the hunt for a red spider conjunctive query determinacy is undecidable"
    - "datalog rewritings of regular path queries using views"
    - "querying the guarded fragment"
    - "the view update problem revisited"

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.DB(Databases)