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: "weighted efficient domination for p_5 kp_2 free graphs in polynomial time"
  Abstract: Let $G$ be a finite undirected graph. A vertex {\em dominates} itself and all its neighbors in $G$. A vertex set $D$ is an {\em efficient dominating set} (\emph{e.d.}\ for short) of $G$ if every vertex of $G$ is dominated by exactly one vertex of $D$. The \emph{Efficient Domination} (ED) problem, which asks for the existence of an e.d.\ in $G$, is known to be \NP-complete even for very restricted graph classes such as for claw-free graphs, for chordal graphs and for $2P_3$-free graphs (and thus, for $P_7$-free graphs). We call a graph $F$ a {\em linear forest} if $F$ is cycle- and claw-free, i.e., its components are paths. Thus, the ED problem remains \NP-complete for $F$-free graphs, whenever $F$ is not a linear forest. Let WED denote the vertex-weighted version of the ED problem asking for an e.d. of minimum weight if one exists. #R##N#In this paper, we show that WED is solvable in polynomial time for $(P_5+kP_2)$-free graphs for every fixed $k$, which solves an open problem, and, using modular decomposition, we improve known time bounds for WED on $(P_4+P_2)$-free graphs, $(P_6,S_{1,2,2})$-free graphs, and on $(2P_3,S_{1,2,2})$-free graphs and simplify proofs. For $F$-free graphs, the only remaining open case is WED on $P_6$-free graphs.

Connected through hyperedge HE-1 (induced by source paper "on efficient domination for some classes of h free bipartite graphs"):
  with members:
    - "polynomial time algorithms for weighted efficient domination problems in at free graphs and dually chordal graphs"
    - "efficient domination for some subclasses of p_6 free graphs in polynomial time"
    - "classifying the clique width of h free bipartite graphs"
    - "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 "on efficient domination for some classes of h free chordal graphs"):
  with members:
    - "polynomial time algorithms for weighted efficient domination problems in at free graphs and dually chordal graphs"
    - "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"
    - "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-3 (induced by source paper "weighted efficient domination for p_6 free graphs in polynomial time"):
  with members:
    - "independence and efficient domination on p_6 free graphs"
    - "weighted efficient domination for p 5 free graphs in linear time"
    - "efficient domination for some subclasses of p_6 free graphs in polynomial time"
    - "new polynomial cases of the weighted efficient domination problem"
    - "algorithms for unipolar and generalized split graphs"

Connected through hyperedge HE-4 (induced by source paper "efficient domination for some subclasses of p_6 free graphs in polynomial time"):
  with members:
    - "polynomial time algorithms for weighted efficient domination problems in at free graphs and dually chordal graphs"
    - "weighted efficient domination in classes of p 6 free graphs"
    - "new polynomial cases of the weighted efficient domination problem"
    - "efficient dominating and edge dominating sets for graphs and hypergraphs"

Connected through hyperedge HE-5 (induced by source paper "weighted efficient domination for p 5 free graphs in linear time"):
  with members:
    - "independence and efficient domination on p_6 free graphs"
    - "efficient domination for some subclasses of p_6 free graphs in polynomial time"
    - "new polynomial cases of the weighted efficient domination problem"

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)