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: "interval colorings of edges of a multigraph"
  Abstract: N = S t≥1 Nt. For every G ∈ N, let us denote by w(G) and W(G), respectively, the least and the greatest t, for which there exists an interval on V (G) t-coloring of G. Evidently, �(G) ≤ � ′ (G) ≤ w(G) ≤ W(G). Proposition 1. If G ∈ N then � ′ (G) = �(G). Proof. Let us consider an interval on V (G) w(G)-coloring of the multigraph G. If w(G) = �(G) then � ′ (G) = �(G). Assume that w(G) > �(G). Let us define the sets T(1),...,T(�(G)), where T(j) = {i/ i ≡ j(mod(�(G))),1 ≤ i ≤ w(G)}, j = 1,...,�(G). Let Ej be the subset of edges of G which are colored by colors from the set T(j), j = 1,...,�(G). Clearly, Ej is a matching. For each j ∈ {1,...,�(G)}, let us color the edges of Ej by the color j. We shall obtain a proper coloring of edges of G with �(G) colors. Hence, � ′ (G) = �(G). The Proposition is proved. Proposition 2. Let G be a regular multigraph. a) G ∈ N iff � ′ (G) = �(G). b) If G ∈ N and �(G) ≤ t ≤ W(G) then G ∈ Nt. Proof. The proposition (a) follows from the proposition 1. The proposition (b) holds, since if t > w(G) then an interval on V (G) (t − 1)-coloring can be obtained from an interval on V (G) t-coloring by recoloring with the color t − �(G) all edges colored by t. The Proposition is proved.

Connected through hyperedge HE-1 (induced by source paper "on interval edge colorings of bipartite graphs"):
  with members:
    - "interval colorings of complete bipartite graphs and trees"
    - "practical graph isomorphism ii"

Connected through hyperedge HE-2 (induced by source paper "interval edge colorings of complete graphs"):
  with members:
    - "interval colorings of complete bipartite graphs and trees"
    - "a note on interval edge colorings of graphs"
    - "interval edge colorings of mobius ladders"

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)