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 history of flips in combinatorial triangulations"
  Abstract: Given two combinatorial triangulations, how many edge flips are necessary and sufficient to convert one into the other? This question has occupied researchers for over 75 years. We provide a comprehensive survey, including full proofs, of the various attempts to answer it.

Connected through hyperedge HE-1 (induced by source paper "flip distance to some plane configurations"):
  with members:
    - "flip distance to a non crossing perfect matching"
    - "flip distance between triangulations of a simple polygon is np complete"
    - "bichromatic compatible matchings"

Connected through hyperedge HE-2 (induced by source paper "arc diagrams flip distances and hamiltonian triangulations"):
  with members:
    - "a lower bound on the diameter of the flip graph"
    - "flip distance between triangulations of a planar point set is apx hard"
    - "making triangulations 4 connected using flips"

Connected through hyperedge HE-3 (induced by source paper "a lower bound on the diameter of the flip graph"):
  with members:
    - "arc diagrams flip distances and hamiltonian triangulations"
    - "making triangulations 4 connected using flips"

Connected through hyperedge HE-4 (induced by source paper "shortest reconfiguration paths in the solution space of boolean formulas"):
  with members:
    - "flip distance between triangulations of a simple polygon is np complete"
    - "vertex cover reconfiguration and beyond"
    - "flip distance between triangulations of a planar point set is apx hard"
    - "recoloring bounded treewidth graphs"
    - "on the parameterized complexity of reconfiguration problems"
    - "a computational trichotomy for connectivity of boolean satisfiability"
    - "flipping edge labelled triangulations"
    - "flip distance between two triangulations of a point set is np complete"

Connected through hyperedge HE-5 (induced by source paper "flipping edge labelled triangulations"):
  with members:
    - "arc diagrams flip distances and hamiltonian triangulations"
    - "flip distance between triangulations of a planar point set is apx hard"
    - "the complexity of rerouting shortest paths"
    - "happy endings for flip graphs"
    - "the connectivity of boolean satisfiability computational and structural dichotomies"

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)