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: "untangling a planar graph"
  Abstract: A straight-line drawing δ of a planar graph G need not be plane but can be made so by untangling it, that is, by moving some of the vertices of G. Let shift(G,δ) denote the minimum number of vertices that need to be moved to untangle δ. We show that shift(G,δ) is NP-hard to compute and to approximate. Our hardness results extend to a version of 1BendPointSetEmbeddability, a well-known graph-drawing problem.#R##N##R##N#Further we define fix(G,δ)=n−shift(G,δ) to be the maximum number of vertices of a planar n-vertex graph G that can be fixed when untangling δ. We give an algorithm that fixes at least $\sqrt{((\log n)-1)/\log\log n}$vertices when untangling a drawing of an n-vertex graph G. If G is outerplanar, the same algorithm fixes at least $\sqrt{n/2}$vertices. On the other hand, we construct, for arbitrarily large n, an n-vertex planar graph G and a drawing δ G of G with $\ensuremath {\mathrm {fix}}(G,\delta_{G})\leq \sqrt{n-2}+1$and an n-vertex outerplanar graph H and a drawing δ H of H with $\ensuremath {\mathrm {fix}}(H,\delta_{H})\leq2\sqrt{n-1}+1$. Thus our algorithm is asymptotically worst-case optimal for outerplanar graphs.

Connected through hyperedge HE-1 (induced by source paper "geometry and generation of a new graph planarity game"):
  with members:
    - "a polynomial bound for untangling geometric planar graphs"
    - "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 "beta stars or on extending a drawing of a connected subgraph"):
  with members:
    - "the complexity of drawing a graph in a polygonal region"
    - "drawing partially embedded and simultaneously planar graphs"
    - "drawing graphs in the plane with a prescribed outer face and polynomial area"

Connected through hyperedge HE-3 (induced by source paper "planar drawings of fixed mobile bigraphs"):
  with members:
    - "multi sided boundary labeling"
    - "on the readability of boundary labeling"
    - "many to one boundary labeling with backbones"
    - "drawing graphs in the plane with a prescribed outer face and polynomial area"
    - "planar drawings of higher genus graphs"

Connected through hyperedge HE-4 (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"
    - "a polynomial bound for untangling geometric planar graphs"

Connected through hyperedge HE-5 (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"
    - "a polynomial bound for untangling geometric planar graphs"
    - "on collinear sets in straight line drawings"

Connected through hyperedge HE-6 (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-7 (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"
    - "a polynomial bound for untangling geometric planar graphs"
    - "on the obfuscation complexity of planar graphs"
    - "algorithms for drawing media"

Connected through hyperedge HE-8 (induced by source paper "simple curve embedding"):
  with members:
    - "can we compute the similarity between surfaces"

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)