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: "the dichotomy of list homomorphisms for digraphs"
  Abstract: The Dichotomy Conjecture for constraint satisfaction problems has been verified for conservative problems (or, equivalently, for list homomorphism problems) by Andrei Bulatov. An earlier case of this dichotomy, for list homomorphisms to undirected graphs, came with an elegant structural distinction between the tractable and intractable cases. Such structural characterization is absent in Bulatov's classification, and Bulatov asked whether one can be found. We provide an answer in the case of digraphs; the technique will apply in a broader context. The key concept we introduce is that of a digraph asteroidal triple (DAT). The dichotomy then takes the following form. If a digraph H has a DAT, then the list homomorphism problem for H is NP-complete; and a DAT-free digraph H has a polynomial time solvable list homomorphism problem. DAT-free graphs can be recognized in polynomial time.

Connected through hyperedge HE-1 (induced by source paper "toward a dichotomy for approximation of h coloring"):
  with members:
    - "interval like graphs and digraphs"
    - "binarisation for valued constraint satisfaction problems"
    - "towards a characterization of constant factor approximable finite valued csps"
    - "bi arc digraphs and conservative polymorphisms"
    - "the complexity of general valued csps"
    - "local distribution and the symmetry gap approximability of multiway partitioning problems"
    - "conservative constraint satisfaction re revisited"
    - "computational complexity of the minimum cost homomorphism problem on three element domains"

Connected through hyperedge HE-2 (induced by source paper "subexponential algorithms for variants of homomorphism problem in string graphs"):
  with members:
    - "planar graphs as l intersection or l contact graphs"
    - "finding hitting and packing cycles in subexponential time on unit disk graphs"
    - "independent feedback vertex set for p_5 free graphs"
    - "optimality program in segment and string graphs"
    - "locally constrained homomorphisms on graphs of bounded treewidth and bounded degree"
    - "optimal parameterized algorithms for planar facility location problems using voronoi diagrams"

Connected through hyperedge HE-3 (induced by source paper "bi arc digraphs and conservative polymorphisms"):
  with members:
    - "a dichotomy theorem for nonuniform csps"
    - "testing assignments to constraint satisfaction problems"
    - "asking the metaquestions in constraint tractability"

Connected through hyperedge HE-4 (induced by source paper "minimum cost homomorphisms with constrained costs"):
  with members:
    - "the complexity of conservative valued csps"
    - "duality for min max orderings and dichotomy for min cost homomorphisms"

Connected through hyperedge HE-5 (induced by source paper "parameterized algorithms for min max multiway cut and list digraph homomorphism"):
  with members:
    - "an fpt 2 approximation for tree cut decomposition"
    - "space complexity of list h colouring a dichotomy"
    - "list h coloring a graph by removing few vertices"
    - "minimum bisection is fixed parameter tractable"
    - "designing fpt algorithms for cut problems using randomized contractions"
    - "minimum k way cut of bounded size is fixed parameter tractable"
    - "finding small separators in linear time via treewidth reduction"
    - "fixed parameter tractability of directed multiway cut parameterized by the size of the cutset"

Connected through hyperedge HE-6 (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"
    - "on the scope of the universal algebraic approach to constraint satisfaction"
    - "a characterisation of first order constraint satisfaction problems"

Connected through hyperedge HE-7 (induced by source paper "space complexity of list h coloring revisited the case of oriented trees"):
  with members:
    - "space complexity of list h colouring a dichotomy"
    - "list h coloring a graph by removing few vertices"
    - "the complexity of the list homomorphism problem for graphs"
    - "minimum cost and list homomorphisms to semicomplete digraphs"

Connected through hyperedge HE-8 (induced by source paper "list h coloring a graph by removing few vertices"):
  with members:
    - "clustering with local restrictions"
    - "space complexity of list h colouring a dichotomy"
    - "faster parameterized algorithms using linear programming"
    - "fixed parameter tractability of multicut in directed acyclic graphs"
    - "directed subset feedback vertex set is fixed parameter tractable"
    - "finding small separators in linear time via treewidth reduction"
    - "fixed parameter tractability of directed multiway cut parameterized by the size of the cutset"
    - "on multiway cut parameterized above lower bounds"

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.CC(Computational Complexity)