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: "polynomial time algorithms for weighted efficient domination problems in at free graphs and dually chordal graphs"
  Abstract: An efficient dominating set (or perfect code) in a graph is a set of vertices the closed neighborhoods of which partition the vertex set of the graph. The minimum weight efficient domination problem is the problem of finding an efficient dominating set of minimum weight in a given vertex-weighted graph; the maximum weight efficient domination problem is defined similarly. We develop a framework for solving the weighted efficient domination problems based on a reduction to the maximum weight independent set problem in the square of the input graph. Using this approach, we improve on several previous results from the literature by deriving polynomial-time algorithms for the weighted efficient domination problems in the classes of dually chordal and AT-free graphs. In particular, this answers a question by Lu and Tang regarding the complexity of the minimum weight efficient domination problem in strongly chordal graphs. A framework for solving the minimum weighted efficient domination (Min-WED) problem is developed.The problem is reduced to the maximum weight independent set problem in the square.The Min-WED problem is polynomial for AT-free graphs and dually chordal graphs.In particular, this answers a question by Lu and Tang.The approach also works for the maximization version of the problem.

Connected through hyperedge HE-1 (induced by source paper "on efficient domination for some classes of h free bipartite graphs"):
  with members:
    - "efficient domination for some subclasses of p_6 free graphs in polynomial time"
    - "classifying the clique width of h free bipartite graphs"
    - "weighted efficient domination for p_5 kp_2 free graphs in polynomial time"
    - "the dilworth number of auto chordal bipartite graphs"
    - "new polynomial cases of the weighted efficient domination problem"
    - "efficient dominating and edge dominating sets for graphs and hypergraphs"

Connected through hyperedge HE-2 (induced by source paper "semitotal domination new hardness results and a polynomial time algorithm for graphs of bounded mim width"):
  with members:
    - "generalized distance domination problems and their complexity on graphs of bounded mim width"
    - "algorithmic aspects of semitotal domination in graphs"
    - "lower bounds on the mim width of some graph classes"
    - "upper domination towards a dichotomy through boundary properties"
    - "new geometric representations and domination problems on tolerance and multitolerance graphs"

Connected through hyperedge HE-3 (induced by source paper "not all equal and 1 in degree decompositions algorithmic complexity and applications"):
  with members:
    - "the parameterized complexity of domination type problems and application to linear codes"
    - "algorithmic complexity of proper labeling problems"
    - "efficient dominating and edge dominating sets for graphs and hypergraphs"
    - "minimum weight triangulation is np hard"

Connected through hyperedge HE-4 (induced by source paper "on efficient domination for some classes of h free chordal graphs"):
  with members:
    - "bounding the clique width of h free chordal graphs"
    - "weighted efficient domination for p_6 free graphs in polynomial time"
    - "efficient domination for some subclasses of p_6 free graphs in polynomial time"
    - "weighted efficient domination for p_5 kp_2 free graphs in polynomial time"
    - "new polynomial cases of the weighted efficient domination problem"
    - "efficient dominating and edge dominating sets for graphs and hypergraphs"
    - "algorithms for unipolar and generalized split graphs"

Connected through hyperedge HE-5 (induced by source paper "efficient domination for some subclasses of p_6 free graphs in polynomial time"):
  with members:
    - "weighted efficient domination in classes of p 6 free graphs"
    - "weighted efficient domination for p_5 kp_2 free graphs in polynomial time"
    - "new polynomial cases of the weighted efficient domination problem"
    - "efficient dominating and edge dominating sets for graphs and hypergraphs"

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.DM(Discrete Mathematics)