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 "weighted efficient domination for p_6 free graphs in polynomial time"):
  Abstract: In a finite undirected graph $G=(V,E)$, a vertex $v \in V$ {\em dominates} itself and its neighbors in $G$. A vertex set $D \subseteq V$ is an {\em efficient dominating set} ({\em e.d.} for short) of $G$ if every $v \in V$ is dominated in $G$ by exactly one vertex of $D$. The {\em Efficient Domination} (ED) problem, which asks for the existence of an e.d. in $G$, is known to be NP-complete for $P_7$-free graphs but solvable in polynomial time for $P_5$-free graphs. The $P_6$-free case was the last open question for the complexity of ED on $F$-free graphs. #R##N#Recently, Lokshtanov, Pilipczuk and van Leeuwen showed that weighted ED is solvable in polynomial time for $P_6$-free graphs, based on their sub-exponential algorithm for the Maximum Weight Independent Set problem for $P_6$-free graphs. Independently, at the same time, Mosca found a polynomial time algorithm for weighted ED on $P_6$-free graphs using a direct approach. In this paper, we describe the details of this approach which is simpler and much faster, namely its time bound is ${\cal O}(n^6 m)$.

Includes members:
  Member "independence and efficient domination on p_6 free graphs":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "maximum weight independent sets for p_7 triangle free graphs in polynomial time")
  Member "weighted efficient domination for p 5 free graphs in linear time":
    also connected through other hyperedges:
      (none)
  Member "efficient domination for some subclasses of p_6 free graphs in polynomial time":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "on efficient domination for some classes of h free bipartite graphs")
  Member "weighted efficient domination for p_5 kp_2 free graphs in polynomial time":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "on efficient domination for some classes of h free bipartite graphs")
  Member "new polynomial cases of the weighted efficient domination problem":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "on efficient domination for some classes of h free bipartite graphs")
  Member "algorithms for unipolar and generalized split graphs":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "solving partition problems almost always requires pushing many vertices around")

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.DM(Discrete Mathematics)