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: "on disjoint matchings in cubic graphs"
  Abstract: For i=2,3 and a cubic graph G let @n"i(G) denote the maximum number of edges that can be covered by i matchings. We show that @n"2(G)>=45|V(G)| and @n"3(G)>=76|V(G)|. Moreover, it turns out that @n"2(G)@?|V(G)|+2@n"3(G)4.

Connected through hyperedge HE-1 (induced by source paper "on the fixed parameter tractability of the maximum 2 edge colorable subgraph problem"):
  with members:
    - "on maximum k edge colorable subgraphs of bipartite graphs"
    - "on disjoint matchings in cubic graphs maximum 2 edge colorable and maximum 3 edge colorable subgraphs"
    - "beyond the vizing s bound for at most seven colors"

Connected through hyperedge HE-2 (induced by source paper "on maximum k edge colorable subgraphs of bipartite graphs"):
  with members:
    - "on disjoint matchings in cubic graphs maximum 2 edge colorable and maximum 3 edge colorable subgraphs"
    - "beyond the vizing s bound for at most seven colors"
    - "on parsimonious edge colouring of graphs with maximum degree three"

Connected through hyperedge HE-3 (induced by source paper "graphs disjoint matchings and some inequalities"):
  with members:
    - "on disjoint matchings in cubic graphs maximum 2 edge colorable and maximum 3 edge colorable subgraphs"
    - "beyond the vizing s bound for at most seven colors"
    - "on parsimonious edge colouring of graphs with maximum degree three"

Connected through hyperedge HE-4 (induced by source paper "on disjoint matchings in cubic graphs maximum 2 edge colorable and maximum 3 edge colorable subgraphs"):
  with members:
    - "characterization of a class of graphs related to pairs of disjoint matchings"
    - "note on edge disjoint pairs of matchings"
    - "a note on minimal matching covered graphs"
    - "on trees with a maximum proper partial 0 1 coloring containing a maximum matching"

Connected through hyperedge HE-5 (induced by source paper "on strongly spanning k edge colorable subgraphs"):
  with members:
    - "on disjoint matchings in cubic graphs maximum 2 edge colorable and maximum 3 edge colorable subgraphs"

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)