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: "well centered triangulation"
  Abstract: Meshes composed of well-centered simplices have nice orthogonal dual meshes (the dual Voronoi diagram). This is useful for certain numerical algorithms that prefer such primal-dual mesh pairs. We prove that well-centered meshes also have optimality properties and relationships to Delaunay and minmax angle triangulations. We present an iterative algorithm that seeks to transform a given triangulation in two or three dimensions into a well-centered one by minimizing a cost function and moving the interior vertices while keeping the mesh connectivity and boundary vertices fixed. The cost function is a direct result of a new characterization of well-centeredness in arbitrary dimensions that we present. Ours is the first optimization-based heuristic for well-centeredness and the first one that applies in both two and three dimensions. We show the results of applying our algorithm to small and large two-dimensional meshes, some with a complex boundary, and obtain a well-centered tetrahedralization of the cube. We also show numerical evidence that our algorithm preserves gradation and that it improves the maximum and minimum angles of acute triangulations created by the best known previous method.

Connected through hyperedge HE-1 (induced by source paper "vorocrust voronoi meshing without clipping"):
  with members:
    - "generalised primal dual grids for unstructured co volume schemes"
    - "spoke darts for high dimensional blue noise sampling"
    - "sampling conditions for conforming voronoi meshing by the vorocrust algorithm"
    - "gap processing for adaptive maximal poisson disk sampling"

Connected through hyperedge HE-2 (induced by source paper "on mesh restrictions to satisfy comparison principles maximum principles and the non negative constraint recent developments and new results"):
  with members:
    - "a numerical framework for diffusion controlled bimolecular reactive systems to enforce maximum principles and the non negative constraint"
    - "a numerical methodology for enforcing maximum principles and the non negative constraint for transient diffusion equations"
    - "a mixed formulation for a modification to darcy equation based on picard linearization and numerical solutions to large scale realistic problems"
    - "a framework for coupled deformation diffusion analysis with application to degradation healing"
    - "enforcing the non negativity constraint and maximum principles for diffusion with decay on general computational grids"
    - "non negative mixed finite element formulations for a tensorial diffusion equation"

Connected through hyperedge HE-3 (induced by source paper "diamond kite adaptive quadrilateral meshing"):
  with members:
    - "planar lombardi drawings for subcubic graphs"
    - "the graphs of planar soap bubbles"
    - "algorithms for coloring quadtrees"
    - "quadrilateral meshing by circle packing"
    - "optimal point placement for mesh smoothing"

Connected through hyperedge HE-4 (induced by source paper "a framework for coupled deformation diffusion analysis with application to degradation healing"):
  with members:
    - "enforcing the non negativity constraint and maximum principles for diffusion with decay on general computational grids"
    - "non negative mixed finite element formulations for a tensorial diffusion equation"

Connected through hyperedge HE-5 (induced by source paper "numerical experiments for darcy flow on a surface using mixed exterior calculus methods"):
  with members:
    - "pydec software and algorithms for discretization of exterior calculus"

Connected through hyperedge HE-6 (induced by source paper "cohomologous harmonic cochains"):
  with members:
    - "pydec software and algorithms for discretization of exterior calculus"
    - "least squares ranking on graphs"
    - "approaching optimality for solving sdd systems"
    - "geometric and combinatorial properties of well centered triangulations in three and higher dimensions"
    - "triangulation of simple 3d shapes with well centered tetrahedra"
    - "nearly linear time algorithms for preconditioning and solving symmetric diagonally dominant linear systems"
    - "nearly linear time algorithms for graph partitioning graph sparsification and solving linear systems"

Connected through hyperedge HE-7 (induced by source paper "geometric and combinatorial properties of well centered triangulations in three and higher dimensions"):
  with members:
    - "technical note delaunay hodge star"
    - "pydec software and algorithms for discretization of exterior calculus"
    - "triangulation of simple 3d shapes with well centered tetrahedra"

Connected through hyperedge HE-8 (induced by source paper "a dihedral acute triangulation of the cube"):
  with members:
    - "triangulation of simple 3d shapes with well centered tetrahedra"
    - "tiling space and slabs with acute tetrahedra"

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)