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 logical difference for the lightweight description logic el"
  Abstract: We study a logic-based approach to versioning of ontologies. Under this view, ontologies provide answers to queries about some vocabulary of interest. The difference between two versions of an ontology is given by the set of queries that receive difierent answers. We investigate this approach for terminologies given in the description logic EL extended with role inclusions and domain and range restrictions for three distinct types of queries: subsumption, instance, and conjunctive queries. In all three cases, we present polynomialtime algorithms that decide whether two terminologies give the same answers to queries over a given vocabulary and compute a succinct representation of the difference if it is nonempty. We present an implementation, CEX2, of the developed algorithms for subsumption and instance queries and apply it to distinct versions of Snomed CT and the NCI ontology.

Connected through hyperedge HE-1 (induced by source paper "query inseparability for alc ontologies"):
  with members:
    - "conservative extensions in guarded and two variable fragments"
    - "inseparability and conservative extensions of description logic ontologies a survey"
    - "optimizing sparql query answering over owl ontologies"
    - "acyclicity notions for existential rules and their application to query answering in ontologies"
    - "ontology based data access a study through disjunctive datalog csp and mmsnp"
    - "exchanging owl 2 ql knowledge bases"
    - "foundations for uniform interpolation and forgetting in expressive description logics"
    - "semantical characterizations and complexity of equivalences in answer set programming"

Connected through hyperedge HE-2 (induced by source paper "when you must forget beyond strong persistence when forgetting in answer set programming"):
  with members:
    - "the rise and fall of semantic rule updates based on se models"
    - "a system of interaction and structure"
    - "on the practical use of variable elimination in constraint optimization problems still life as a case study"
    - "semantical characterizations and complexity of equivalences in answer set programming"
    - "an abductive framework for computing knowledge base updates"
    - "propositional independence formula variable independence and forgetting"

Connected through hyperedge HE-3 (induced by source paper "exact learning of lightweight description logic ontologies"):
  with members:
    - "ontology based data access a study through disjunctive datalog csp and mmsnp"
    - "description logic tboxes model theoretic characterizations and rewritability"
    - "the dl lite family and relations"
    - "learning concept hierarchies from text corpora using formal concept analysis"
    - "a semantics and complete algorithm for subsumption in the classic description logic"

Connected through hyperedge HE-4 (induced by source paper "inseparability and conservative extensions of description logic ontologies a survey"):
  with members:
    - "query based entailment and inseparability for alc ontologies full version"
    - "ontology based data access a study through disjunctive datalog csp and mmsnp"
    - "reasoning over ontologies with hidden content the import by query approach"
    - "foundations for uniform interpolation and forgetting in expressive description logics"
    - "description logic tboxes model theoretic characterizations and rewritability"
    - "variable forgetting in reasoning about knowledge"
    - "the dl lite family and relations"
    - "conjunctive query answering for the description logic shiq"

Connected through hyperedge HE-5 (induced by source paper "query based entailment and inseparability for alc ontologies full version"):
  with members:
    - "ontology based data access a study through disjunctive datalog csp and mmsnp"

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)