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 "crossing numbers and stress of random graphs"):
  Abstract: Consider a random geometric graph over a random point process in $\mathbb{R}^d$. Two points are connected by an edge if and only if their distance is bounded by a prescribed distance parameter. We show that projecting the graph onto a two dimensional plane is expected to yield a constant-factor crossing number (and rectilinear crossing number) approximation. We also show that the crossing number is positively correlated to the stress of the graph's projection.

Includes members:
  Member "approximating the rectilinear crossing number":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "exact crossing number parameterized by vertex cover")
  Member "crossing number for graphs with bounded pathwidth":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "exact crossing number parameterized by vertex cover")
  Member "inserting multiple edges into a planar graph":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "an experimental study of a 1 planarity testing and embedding algorithm")
  Member "hardness of approximation for crossing number":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "exact crossing number parameterized by vertex cover")
  Member "an algorithm for the graph crossing number problem":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "exact crossing number parameterized by vertex cover")

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)