human: Given a hyperedge-centered hypergraph: <hypergraph>, where the center hyperedge is induced by one source paper and its member nodes are the cited papers.

Details of the hypergraph:
Center hyperedge (induced by source paper "finite model reasoning in expressive fragments of first order logic"):
  Abstract: Over the past two decades several fragments of first-order logic have been identified and shown to have good computational and algorithmic properties, to a great extent as a result of appropriately describing the image of the standard translation of modal logic to first-order logic. This applies most notably to the guarded fragment, where quantifiers are appropriately relativized by atoms, and the fragment defined by restricting the number of variables to two. The aim of this talk is to review recent work concerning these fragments and their popular extensions. When presenting the material special attention is given to decision procedures for the finite satisfiability problems, as many of the fragments discussed contain infinity axioms. We highlight most effective techniques used in this context, their advantages and limitations. We also mention a few open directions of study.

Includes members:
  Member "two variable logic with counting and a linear order":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "order invariance of two variable logic is decidable")
  Member "querying the guarded fragment":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "finite open world query answering with number restrictions")
  Member "two variable logic with two order relations":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "synthesis of data word transducers")
  Member "satisfiability vs finite satisfiability in elementary modal logics":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "finite satisfiability of the two variable guarded fragment with transitive guards and related variants")
  Member "nominals inverses counting and conjunctive queries or why infinity is your friend":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "a practical acyclicity notion for query answering over horn mathcal sriq ontologies")
  Member "complexity of the guarded two variable fragment with counting quantifiers":
    also connected through other hyperedges:
      - Hyperedge HE-6 (induced by source paper "ontology focusing knowledge enriched databases on demand")

Question: Please tell me which class the source paper 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)