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 "on a constructive characterization of a class of trees related to pairs of disjoint matchings"):
  Abstract: For a graph consider the pairs of disjoint matchings which union contains as many edges as possible, and define a parameter $\alpha$ which eqauls the cardinality of the largest matching in those pairs. Also, define $\betta$ to be the cardinality of a maximum matching of the graph. #R##N#We give a constructive characterization of trees which satisfy the $\alpha$=$\betta$ equality. The proof of our main theorem is based on a new decomposition algorithm obtained for trees.

Includes members:
  Member "characterization of a class of graphs related to pairs of disjoint matchings":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "on disjoint matchings in cubic graphs maximum 2 edge colorable and maximum 3 edge colorable subgraphs")
  Member "on complexity of special maximum matchings constructing":
    also connected through other hyperedges:
      - Hyperedge HE-2 (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-3 (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-4 (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-5 (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-6 (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)