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 "untangling planar graphs from a specified vertex position hard cases"):
  Abstract: Given a planar graph G, we consider drawings of G in the plane where edges are represented by straight line segments (which possibly intersect). Such a drawing is specified by an injective embedding @p of the vertex set of G into the plane. Let fix(G,@p) be the maximum integer k such that there exists a crossing-free redrawing @p^' of G which keeps k vertices fixed, i.e., there exist k vertices v"1,...,v"k of G such that @p(v"i)[email protected]^'(v"i) for i=1,...,k. Given a set of points X, let fix^X(G) denote the value of fix(G,@p) minimized over @p locating the vertices of G on X. The absolute minimum of fix(G,@p) is denoted by fix(G). For the wheel graph W"n, we prove that fix^X(W"n)@?(2+o(1))n for every X. With a somewhat worse constant factor this is also true for the fan graph F"n. We inspect also other graphs for which it is known that fix(G)=O(n). We also show that the minimum value fix(G) of the parameter fix^X(G) is always attainable by a collinear X.

Includes members:
  Member "untangling polygons and graphs":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "drawing planar graphs with many collinear vertices")
  Member "untangling a planar graph":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "geometry and generation of a new graph planarity game")
  Member "a polynomial bound for untangling geometric planar graphs":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "geometry and generation of a new graph planarity game")
  Member "on collinear sets in straight line drawings":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "cubic planar graphs that cannot be drawn on few lines")
  Member "on the obfuscation complexity of planar graphs":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "geometry and generation of a new graph planarity game")
  Member "moving vertices to make drawings plane":
    also connected through other hyperedges:
      - Hyperedge HE-6 (induced by source paper "geometry and generation of a new graph planarity game")

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)