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: "dominating induced matchings for p7 free graphs in linear time"
  Abstract: Let $G$ be a finite undirected graph with edge set $E$. An edge set $E' \subseteq E$ is an {\em induced matching} in $G$ if the pairwise distance of the edges of $E'$ in $G$ is at least two; $E'$ is {\em dominating} in $G$ if every edge $e \in E \setminus E'$ intersects some edge in $E'$. The \emph{Dominating Induced Matching Problem} (\emph{DIM}, for short) asks for the existence of an induced matching $E'$ which is also dominating in $G$; this problem is also known as the \emph{Efficient Edge Domination} Problem. #R##N#The DIM problem is related to parallel resource allocation problems, encoding theory and network routing. It is \NP-complete even for very restricted graph classes such as planar bipartite graphs with maximum degree three. However, its complexity was open for $P_k$-free graphs for any $k \ge 5$; $P_k$ denotes a chordless path with $k$ vertices and $k-1$ edges. We show in this paper that the weighted DIM problem is solvable in linear time for $P_7$-free graphs in a robust way.

Connected through hyperedge HE-1 (induced by source paper "exact algorithms for dominating induced matching based on graph partition"):
  with members:
    - "an o 1 1939 n time algorithm for minimum weighted dominating induced matching"
    - "exact algorithms for dominating induced matchings"
    - "efficient dominating and edge dominating sets for graphs and hypergraphs"

Connected through hyperedge HE-2 (induced by source paper "an o 1 1939 n time algorithm for minimum weighted dominating induced matching"):
  with members:
    - "exact algorithms for dominating induced matchings"
    - "efficient dominating and edge dominating sets for graphs and hypergraphs"
    - "determinant sums for undirected hamiltonicity"

Connected through hyperedge HE-3 (induced by source paper "new polynomial cases of the weighted efficient domination problem"):
  with members:
    - "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)