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: "sound complete and minimal ucq rewriting for existential rules"
  Abstract: We address the issue of Ontology-Based Data Access, with ontologies represented in the framework of existential rules, also known as Datalog+/-. A well-known approach involves rewriting the query using ontological knowledge. We focus here on the basic rewriting technique which consists of rewriting the initial query into a union of conjunctive queries. First, we study a generic breadth-first rewriting algorithm, which takes as input any rewriting operator, and define properties of rewriting operators that ensure the correctness of the algorithm. Then, we focus on piece-unifiers, which provide a rewriting operator with the desired properties. Finally, we propose an implementation of this framework and report some experiments.

Connected through hyperedge HE-1 (induced by source paper "the space efficient core of vadalog"):
  with members:
    - "reachability is in dynfo"
    - "query rewriting and optimization for ontological databases"

Connected through hyperedge HE-2 (induced by source paper "computing fo rewritings in mathcal el in practice from atomic to conjunctive queries"):
  with members:
    - "containment for rule based ontology mediated queries"
    - "answering conjunctive queries over mathcal el knowledge bases with transitive and reflexive roles"
    - "ontology based data access a study through disjunctive datalog csp and mmsnp"
    - "the dl lite family and relations"

Connected through hyperedge HE-3 (induced by source paper "the complexity of ontology based data access with owl 2 ql and bounded treewidth queries"):
  with members:
    - "query rewriting and optimization for ontological databases"
    - "tree like queries in owl 2 ql succinctness and complexity results"
    - "acyclicity notions for existential rules and their application to query answering in ontologies"
    - "exponential lower bounds and separation for query rewriting"

Connected through hyperedge HE-4 (induced by source paper "ontology mediated queries combined complexity and succinctness of rewritings via circuit complexity"):
  with members:
    - "the complexity of ontology based data access with owl 2 ql and bounded treewidth queries"
    - "theoretically optimal datalog rewritings for owl 2 ql ontology mediated queries"
    - "datalog rewritability of disjunctive datalog programs and its applications to ontology reasoning"
    - "tree like queries in owl 2 ql succinctness and complexity results"
    - "ontology based data access a study through disjunctive datalog csp and mmsnp"
    - "exponential lower bounds and separation for query rewriting"
    - "rewriting ontological queries into small nonrecursive datalog programs"
    - "description logic tboxes model theoretic characterizations and rewritability"

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.AI(Artificial Intelligence)