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 "on the scope of the universal algebraic approach to constraint satisfaction"):
  Abstract: The universal-algebraic approach has proved a powerful tool in the study of#N#the complexity of CSPs. This approach has previously been applied to the study#N#of CSPs with finite or (infinite) omega-categorical templates, and relies on#N#two facts. The first is that in finite or omega-categorical structures A, a#N#relation is primitive positive definable if and only if it is preserved by the#N#polymorphisms of A. The second is that every finite or omega-categorical#N#structure is homomorphically equivalent to a core structure. In this paper, we#N#present generalizations of these facts to infinite structures that are not#N#necessarily omega-categorical. (This abstract has been severely curtailed by#N#the space constraints of arXiv -- please read the full abstract in the#N#article.) Finally, we present applications of our general results to the#N#description and analysis of the complexity of CSPs. In particular, we give#N#general hardness criteria based on the absence of polymorphisms that depend on#N#more than one argument, and we present a polymorphism-based description of#N#those CSPs that are first-order definable (and therefore can be solved in#N#polynomial time).

Includes members:
  Member "complexity of existential positive first order logic":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "an algebraic preservation theorem for aleph zero categorical quantified constraint satisfaction")
  Member "cores of countably categorical structures":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "topology is relevant in a dichotomy conjecture for infinite domain constraint satisfaction problems")
  Member "a characterisation of first order constraint satisfaction problems":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "rewritability in monadic disjunctive datalog mmsnp and expressive description logics")

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)