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 parsimonious edge colouring of graphs with maximum degree three"
  Abstract: In a graph $G$ of maximum degree $\Delta$ let $\gamma$ denote the largest fraction of edges that can be $\Delta$ edge-coloured. Albertson and Haas showed that $\gamma \geq 13/15$ when $G$ is cubic . We show here that this result can be extended to graphs with maximum degree 3 with the exception of a graph on 5 vertices. Moreover, there are exactly two graphs with maximum degree 3 (one being obviously the Petersen graph) for which $\gamma = 13/15$. This extends a result given by Steffen. These results are obtained by using structural properties of the so called $\delta$-minimum edge colourings for graphs with maximum degree 3. Keywords : Cubic graph; Edge-colouring

Connected through hyperedge HE-1 (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 disjoint matchings in cubic graphs"

Connected through hyperedge HE-2 (induced by source paper "on s packing edge colorings of cubic graphs"):
  with members:
    - "on packing chromatic number of subcubic outerplanar graphs"
    - "subdivision into i packings and s packing chromatic number of some lattices"
    - "s packing colorings of cubic graphs"
    - "small snarks with large oddness"

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 disjoint matchings in cubic graphs"

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)