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: "a polynomial bound for untangling geometric planar graphs"
  Abstract: To untangle a geometric graph means to move some of the vertices so that the resulting geometric graph has no crossings. Pach and Tardos (Discrete Comput. Geom. 28(4): 585–592, 2002) asked if every n-vertex geometric planar graph can be untangled while keeping at least n e vertices fixed. We answer this question in the affirmative with e=1/4. The previous best known bound was $\Omega(\sqrt{\log n/\log\log n})$. We also consider untangling geometric trees. It is known that every n-vertex geometric tree can be untangled while keeping at least $\Omega(\sqrt{n})$vertices fixed, while the best upper bound was $\mathcal{O}((n\log n)^{2/3})$. We answer a question of Spillner and Wolff (http://arxiv.org/abs/0709.0170) by closing this gap for untangling trees. In particular, we show that for infinitely many values of n, there is an n-vertex geometric tree that cannot be untangled while keeping more than $3(\sqrt{n}-1)$vertices fixed.

Connected through hyperedge HE-1 (induced by source paper "geometry and generation of a new graph planarity game"):
  with members:
    - "untangling a planar graph"
    - "minimum weight triangulation is np hard"
    - "on the obfuscation complexity of planar graphs"
    - "moving vertices to make drawings plane"

Connected through hyperedge HE-2 (induced by source paper "efficient generation of geographically accurate transit maps"):
  with members:
    - "a comparison and evaluation of map construction algorithms using vehicle tracking data"
    - "ordering metro lines by block crossings"
    - "metro line crossing minimization hardness approximations and tractable cases"
    - "untangling a planar graph"

Connected through hyperedge HE-3 (induced by source paper "drawing planar graphs with many collinear vertices"):
  with members:
    - "the utility of untangling"
    - "a note on planar partial 3 trees"
    - "untangling planar graphs from a specified vertex position hard cases"
    - "untangling polygons and graphs"
    - "untangling a planar graph"
    - "on collinear sets in straight line drawings"

Connected through hyperedge HE-4 (induced by source paper "the utility of untangling"):
  with members:
    - "superpatterns and universal point sets"
    - "sefe with no mapping via large induced outerplane graphs in plane graphs"
    - "how many vertex locations can be arbitrarily chosen when drawing planar graphs"
    - "on universal point sets for planar graphs"
    - "simultaneous embedding of planar graphs"
    - "untangling planar graphs from a specified vertex position hard cases"
    - "untangling polygons and graphs"
    - "on a tree and a path with no geometric simultaneous embedding"

Connected through hyperedge HE-5 (induced by source paper "drawing arrangement graphs in small grids or how to play planarity"):
  with members:
    - "superpatterns and universal point sets"
    - "universal point sets for planar three tree"
    - "untangling polygons and graphs"
    - "untangling a planar graph"
    - "on the obfuscation complexity of planar graphs"
    - "algorithms for drawing media"

Connected through hyperedge HE-6 (induced by source paper "untangling planar graphs from a specified vertex position hard cases"):
  with members:
    - "untangling polygons and graphs"
    - "untangling a planar graph"
    - "on collinear sets in straight line drawings"
    - "on the obfuscation complexity of planar graphs"
    - "moving vertices to make drawings plane"

Connected through hyperedge HE-7 (induced by source paper "untangling polygons and graphs"):
  with members:
    - "untangling a planar graph"
    - "on collinear sets in straight line drawings"
    - "on the obfuscation complexity of planar graphs"
    - "moving vertices to make drawings plane"

Connected through hyperedge HE-8 (induced by source paper "untangling a planar graph"):
  with members:
    - "untangling polygons and graphs"
    - "on the obfuscation complexity of planar graphs"
    - "moving vertices to make drawings plane"
    - "the problem of compatible representatives"

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.CG(Computational Geometry)