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 "a finer reduction of constraint problems to digraphs"):
  Abstract: It is well known that the constraint satisfaction problem over a general#N#relational structure A is polynomial time equivalent to the constraint problem#N#over some associated digraph. We present a variant of this construction and#N#show that the corresponding constraint satisfaction problem is logspace#N#equivalent to that over A. Moreover, we show that almost all of the commonly#N#encountered polymorphism properties are held equivalently on the A and the#N#constructed digraph. As a consequence, the Algebraic CSP dichotomy conjecture#N#as well as the conjectures characterizing CSPs solvable in logspace and in#N#nondeterministic logspace are equivalent to their restriction to digraphs.

Includes members:
  Member "the complexity of general valued csps":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "the complexity of boolean surjective general valued csps")
  Member "an algebraic theory of complexity for discrete optimization":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "the complexity of boolean surjective general valued csps")
  Member "on the reduction of the csp dichotomy conjecture to digraphs":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "hybrid v csps and algebraic reductions")
  Member "absorbing subalgebras cyclic terms and the constraint satisfaction problem":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "topology is relevant in a dichotomy conjecture for infinite domain constraint satisfaction problems")
  Member "on the scope of the universal algebraic approach to constraint satisfaction":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "finite relation algebras with normal representations")
  Member "the dichotomy of list homomorphisms for digraphs":
    also connected through other hyperedges:
      - Hyperedge HE-6 (induced by source paper "toward a dichotomy for approximation of h coloring")
  Member "a characterisation of first order constraint satisfaction problems":
    also connected through other hyperedges:
      - Hyperedge HE-7 (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.CC(Computational Complexity)