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: "making triangulations 4 connected using flips"
  Abstract: We show that any combinatorial triangulation on n vertices can be transformed into a 4-connected one using at most @?(3n-9)/[email protected]? edge flips. We also give an example of an infinite family of triangulations that requires this many flips to be made 4-connected, showing that our bound is tight. In addition, for n>=19, we improve the upper bound on the number of flips required to transform any 4-connected triangulation into the canonical triangulation (the triangulation with two dominant vertices), matching the known lower bound of 2n-15. Our results imply a new upper bound on the diameter of the flip graph of 5.2n-33.6, improving on the previous best known bound of 6n-30.

Connected through hyperedge HE-1 (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"
    - "a history of flips in combinatorial triangulations"

Connected through hyperedge HE-2 (induced by source paper "non aligned drawings of planar graphs"):
  with members:
    - "arc diagrams flip distances and hamiltonian triangulations"
    - "drawing planar graphs with many collinear vertices"
    - "the 3 1 ordering for 4 connected planar triangulations"

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"
    - "a history of flips in combinatorial triangulations"

Connected through hyperedge HE-4 (induced by source paper "practical reduction of edge flip sequences in two dimensional triangulations"):
  with members:
    - "flip distance between triangulations of a simple polygon is np complete"
    - "flip distance between triangulations of a planar point set is apx hard"
    - "flip distance between two triangulations of a point set is np complete"
    - "happy endings for flip graphs"

Connected through hyperedge HE-5 (induced by source paper "flip distance between two triangulations of a point set is np complete"):
  with members:
    - "flip distance between triangulations of a simple polygon is np complete"
    - "flip distance between triangulations of a planar point set is apx hard"
    - "happy endings for flip graphs"
    - "rotation distance is fixed parameter tractable"

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)