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: "nominals inverses counting and conjunctive queries or why infinity is your friend"
  Abstract: Description Logics are knowledge representation formalisms that provide, for example, the logical underpinning of the W3C OWL standards. Conjunctive queries, the standard query language in databases, have recently gained significant attention as an expressive formalism for querying Description Logic knowledge bases. Several different techniques for deciding conjunctive query entailment are available for a wide range of DLs. Nevertheless, the combination of nominals, inverse roles, and number restrictions in OWL 1 and OWL 2 DL causes unsolvable problems for the techniques hitherto available. We tackle this problem and present a decidability result for entailment of unions of conjunctive queries in the DL ALCHOIQb that contains all three problematic constructors simultaneously. Provided that queries contain only simple roles, our result also shows decidability of entailment of (unions of) conjunctive queries in the logic that underpins OWL 1 DL and we believe that the presented results will pave the way for further progress towards conjunctive query entailment decision procedures for the Description Logics underlying the OWL standards.

Connected through hyperedge HE-1 (induced by source paper "finite model reasoning in expressive fragments of first order logic"):
  with members:
    - "two variable logic with counting and a linear order"
    - "querying the guarded fragment"
    - "two variable logic with two order relations"
    - "satisfiability vs finite satisfiability in elementary modal logics"
    - "complexity of the guarded two variable fragment with counting quantifiers"

Connected through hyperedge HE-2 (induced by source paper "a practical acyclicity notion for query answering over horn mathcal sriq ontologies"):
  with members:
    - "introducing nominals to the combined query answering approaches for el"
    - "acyclicity notions for existential rules and their application to query answering in ontologies"
    - "conjunctive query answering for the description logic shiq"

Connected through hyperedge HE-3 (induced by source paper "worst case optimal query answering for greedy sets of existential rules and their subclasses"):
  with members:
    - "query rewriting and optimization for ontological databases"
    - "type elimination based reasoning for the description logic shiqbs using decision diagrams and disjunctive datalog"
    - "extensions of simple conceptual graphs the complexity of rules and constraints"

Connected through hyperedge HE-4 (induced by source paper "acyclicity notions for existential rules and their application to query answering in ontologies"):
  with members:
    - "on chase termination beyond stratification"
    - "hypertableau reasoning for description logics"
    - "conjunctive query answering for the description logic shiq"
    - "the dlv system for knowledge representation and reasoning"
    - "deciding regular grammar logics with converse through first order 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)