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 "characterization of a class of graphs related to pairs of disjoint matchings"):
  Abstract: For a given graph consider a pair of disjoint matchings the union of which contains as many edges as possible. Furthermore, consider the ratio of the cardinalities of a maximum matching and the largest matching in those pairs. It is known that for any graph 54 is the tight upper bound for this ratio. We characterize the class of graphs for which it is precisely 54. Our characterization implies that these graphs contain a spanning subgraph, every connected component of which is the minimal graph of this class.

Includes members:
  Member "on complexity of special maximum matchings constructing":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "on upper bounds for parameters related to the construction of special maximum matchings")
  Member "note on edge disjoint pairs of matchings":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "on disjoint matchings in cubic graphs maximum 2 edge colorable and maximum 3 edge colorable subgraphs")
  Member "two polynomial algorithms for special maximum matching constructing in trees":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "on upper bounds for parameters related to the construction of special maximum matchings")
  Member "a note on minimal matching covered graphs":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "on disjoint matchings in cubic graphs maximum 2 edge colorable and maximum 3 edge colorable subgraphs")
  Member "on trees with a maximum proper partial 0 1 coloring containing a maximum matching":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "on disjoint matchings in cubic graphs maximum 2 edge colorable and maximum 3 edge colorable subgraphs")

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)