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: "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).

Connected through hyperedge HE-1 (induced by source paper "finite relation algebras with normal representations"):
  with members:
    - "a universal algebraic proof of the complexity dichotomy for monotone monadic snp"
    - "a dichotomy theorem for nonuniform csps"
    - "the proof of csp dichotomy conjecture"
    - "constraint satisfaction problems for reducts of homogeneous graphs"
    - "the algebraic dichotomy conjecture for infinite domain constraint satisfaction problems"
    - "a complexity dichotomy for poset constraint satisfaction"
    - "the complexity of phylogeny constraint satisfaction problems"
    - "cores of countably categorical structures"

Connected through hyperedge HE-2 (induced by source paper "distance constraint satisfaction problems"):
  with members:
    - "constraint satisfaction tractability from semi lattice operations on infinite sets"
    - "schaefer s theorem for graphs"
    - "linear logic based analysis of constraint handling rules with disjunction"
    - "cores of countably categorical structures"
    - "adventures in time and space"

Connected through hyperedge HE-3 (induced by source paper "a finer reduction of constraint problems to digraphs"):
  with members:
    - "the complexity of general valued csps"
    - "an algebraic theory of complexity for discrete optimization"
    - "on the reduction of the csp dichotomy conjecture to digraphs"
    - "absorbing subalgebras cyclic terms and the constraint satisfaction problem"
    - "the dichotomy of list homomorphisms for digraphs"
    - "a characterisation of first order constraint satisfaction problems"

Connected through hyperedge HE-4 (induced by source paper "an algebraic preservation theorem for aleph zero categorical quantified constraint satisfaction"):
  with members:
    - "quantified constraints and containment problems"
    - "complexity of existential positive first order logic"
    - "the complexity of positive first order logic without equality"
    - "the complexity of quantified constraint satisfaction collapsibility sink algebras and the three element case"

Connected through hyperedge HE-5 (induced by source paper "complexity classification in infinite domain constraint satisfaction"):
  with members:
    - "absorbing subalgebras cyclic terms and the constraint satisfaction problem"
    - "tractable set constraints"
    - "datalog and constraint satisfaction with infinite templates"
    - "a fast algorithm and datalog inexpressibility for temporal reasoning"
    - "cores of countably categorical structures"
    - "a characterisation of first order constraint satisfaction problems"
    - "linear datalog and bounded path duality of relational structures"
    - "a complete classification of tractability in rcc 5"

Connected through hyperedge HE-6 (induced by source paper "constraint satisfaction tractability from semi lattice operations on infinite sets"):
  with members:
    - "arc consistency and friends"
    - "a fast algorithm and datalog inexpressibility for temporal reasoning"
    - "cores of countably categorical structures"

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)