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: "some results on point visibility graphs"
  Abstract: In this paper, we present three necessary conditions for recognizing point visibility graphs. We show that this recognition problem lies in PSPACE. We state new properties of point visibility graphs along with some known properties that are important in understanding point visibility graphs. For planar point visibility graphs, we present a complete characterization which leads to a linear time recognition and reconstruction algorithm.

Connected through hyperedge HE-1 (induced by source paper "pseudo triangle visibility graph characterization and reconstruction"):
  with members:
    - "recognition and complexity of point visibility graphs"
    - "unsolved problems in visibility graphs of points segments and polygons"

Connected through hyperedge HE-2 (induced by source paper "computational complexity aspects of point visibility graphs"):
  with members:
    - "on colouring point visibility graphs"
    - "recognition and complexity of point visibility graphs"
    - "finding points in general position"
    - "unsolved problems in visibility graphs of points segments and polygons"

Connected through hyperedge HE-3 (induced by source paper "on colouring point visibility graphs"):
  with members:
    - "partitions of planar point sets into polygons"
    - "recognition and complexity of point visibility graphs"
    - "point visibility graph recognition is np hard"
    - "unsolved problems in visibility graphs of points segments and polygons"

Connected through hyperedge HE-4 (induced by source paper "partitions of planar point sets into polygons"):
  with members:
    - "recognition and complexity of point visibility graphs"
    - "unsolved problems in visibility graphs of points segments and polygons"

Connected through hyperedge HE-5 (induced by source paper "recognition and complexity of point visibility graphs"):
  with members:
    - "point visibility graph recognition is np hard"
    - "unsolved problems in visibility graphs of points segments and polygons"

Connected through hyperedge HE-6 (induced by source paper "finding points in general position"):
  with members:
    - "towards optimal and expressive kernelization for d hitting set"
    - "point line cover the easy kernel is essentially tight"

Connected through hyperedge HE-7 (induced by source paper "point visibility graph recognition is np hard"):
  with members:
    - "unsolved problems in visibility graphs of points segments and polygons"

Connected through hyperedge HE-8 (induced by source paper "unsolved problems in visibility graphs of points segments and polygons"):
  with members:
    - "convex obstacle numbers of outerplanar graphs and bipartite permutation graphs"
    - "a new upper bound for the vc dimension of visibility regions"
    - "improved approximation for guarding simple galleries from the perimeter"

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)