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: "flip distance between two triangulations of a point set is np complete"
  Abstract: Given two triangulations of a convex polygon, computing the minimum number of flips required to transform one to the other is a long-standing open problem. It is not known whether the problem is in P or NP-complete. We prove that two natural generalizations of the problem are NP-complete, namely computing the minimum number of flips between two triangulations of (1) a polygon with holes; (2) a set of points in the plane.

Connected through hyperedge HE-1 (induced by source paper "shortest reconfiguration of perfect matchings via alternating cycles"):
  with members:
    - "the perfect matching reconfiguration problem"
    - "shortest reconfiguration of matchings"
    - "the time complexity of permutation routing via matching token swapping and a variant"
    - "flip distance between triangulations of a simple polygon is np complete"
    - "shortest reconfiguration of sliding tokens on a caterpillar"
    - "flip distance between triangulations of a planar point set is apx hard"
    - "finding shortest paths between graph colourings"
    - "shortest reconfiguration paths in the solution space of boolean formulas"

Connected through hyperedge HE-2 (induced by source paper "on the parameterized complexity of reconfiguration of connected dominating sets"):
  with members:
    - "empirical evaluation of approximation algorithms for generalized graph coloring and uniform quasi wideness"
    - "reconfiguration on nowhere dense graph classes"
    - "polynomial kernels and wideness properties of nowhere dense graph classes"
    - "neighborhood complexity and kernelization for nowhere dense classes of graphs"
    - "reconfiguration of dominating sets"
    - "kernelization using structural parameters on sparse graph classes"
    - "deciding first order properties of nowhere dense graphs"
    - "the complexity of change"

Connected through hyperedge HE-3 (induced by source paper "the perfect matching reconfiguration problem"):
  with members:
    - "on counting perfect matchings in general graphs"
    - "counting perfect matchings and the switch chain"
    - "token jumping in minor closed classes"
    - "parameterized complexity of graph constraint logic"
    - "reconfiguring independent sets in cographs"
    - "the complexity of change"
    - "pspace completeness of sliding block puzzles and other problems through the nondeterministic constraint logic model of computation"

Connected through hyperedge HE-4 (induced by source paper "a note on the flip distance problem for edge labeled 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"
    - "flipping edge labelled triangulations"

Connected through hyperedge HE-5 (induced by source paper "the complexity of independent set reconfiguration on bipartite graphs"):
  with members:
    - "polynomial time algorithms for sliding tokens on cactus graphs and block graphs"
    - "token sliding on chordal graphs"
    - "reconfiguration on sparse graphs"
    - "reconfiguring independent sets in claw free graphs"
    - "vertex cover reconfiguration and beyond"
    - "homomorphism reconfiguration via homotopy"
    - "shortest reconfiguration paths in the solution space of boolean formulas"
    - "reconfiguration in bounded bandwidth and treedepth"

Connected through hyperedge HE-6 (induced by source paper "a proof of the orbit conjecture for flipping edge labelled triangulations"):
  with members:
    - "reconfiguring ordered bases of a matroid"
    - "flips in edge labelled pseudo triangulations"
    - "flip distance between triangulations of a simple polygon is np complete"
    - "flip distance between triangulations of a planar point set is apx hard"
    - "computing the flip distance between triangulations"
    - "the complexity of change"
    - "flipping edge labelled triangulations"
    - "happy endings for flip graphs"

Connected through hyperedge HE-7 (induced by source paper "reconfiguration on sparse graphs"):
  with members:
    - "reconfiguration on nowhere dense graph classes"
    - "token jumping in minor closed classes"
    - "polynomial kernels and wideness properties of nowhere dense graph classes"
    - "faster online matrix vector multiplication"
    - "vertex cover reconfiguration and beyond"
    - "reconfiguration over tree decompositions"
    - "finding shortest paths between graph colourings"
    - "reconfiguration in bounded bandwidth and treedepth"

Connected through hyperedge HE-8 (induced by source paper "flip distance between triangulations of a simple polygon is np complete"):
  with members:
    - "flip distance between triangulations of a planar point set is apx hard"
    - "flip distance is in fpt time o n k cdot c k"
    - "happy endings for flip graphs"

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)