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: "counting triangulations of planar point sets"
  Abstract: We study the maximal number of triangulations that a planar set of $n$ points can have, and show that it is at most $30^n$. This new bound is achieved by a careful optimization of the charging scheme of Sharir and Welzl (2006), which has led to the previous best upper bound of $43^n$ for the problem. #R##N#Moreover, this new bound is useful for bounding the number of other types of planar (i.e., crossing-free) straight-line graphs on a given point set. Specifically, we derive new upper bounds for the number of planar graphs ($o(239.4^n)$), spanning cycles ($O(70.21^n)$), and spanning trees ($160^n$).

Connected through hyperedge HE-1 (induced by source paper "from crossing free graphs on wheel sets to embracing simplices and polytopes with few vertices"):
  with members:
    - "a new lower bound on the maximum number of plane graphs using production matrices"
    - "approximating the simplicial depth"
    - "counting plane graphs perfect matchings spanning cycles and kasteleyn s technique"
    - "bounds on the maximum multiplicity of some common geometric graphs"

Connected through hyperedge HE-2 (induced by source paper "colored ray configurations"):
  with members:
    - "counting plane graphs perfect matchings spanning cycles and kasteleyn s technique"
    - "the clique problem in ray intersection graphs"
    - "counting plane graphs flippability and its applications"
    - "bounds on the maximum multiplicity of some common geometric graphs"

Connected through hyperedge HE-3 (induced by source paper "exact uniform sampling over catalan structures"):
  with members:
    - "counting triangulations and other crossing free structures approximately"

Connected through hyperedge HE-4 (induced by source paper "matchings in geometric graphs"):
  with members:
    - "packing plane spanning trees and paths in complete geometric graphs"
    - "flip distance to a non crossing perfect matching"
    - "balanced partitions of 3 colored geometric sets in the plane"
    - "packing plane perfect matchings into a point set"
    - "10 gabriel graphs are hamiltonian"
    - "higher order triangular distance delaunay graphs graph theoretical properties"
    - "approximating the bottleneck plane perfect matching of a point set"
    - "fixed orientation equilateral triangle matching of point sets"

Connected through hyperedge HE-5 (induced by source paper "counting and enumerating crossing free geometric graphs"):
  with members:
    - "peeling and nibbling the cactus subexponential time algorithms for counting triangulations and related problems"
    - "counting triangulations and other crossing free structures approximately"
    - "a simple sweep line algorithm for counting triangulations and pseudo triangulations"
    - "counting plane graphs cross graph charging schemes"
    - "counting plane graphs perfect matchings spanning cycles and kasteleyn s technique"
    - "counting plane graphs flippability and its applications"
    - "bounds on the maximum multiplicity of some common geometric graphs"

Connected through hyperedge HE-6 (induced by source paper "monotone paths in geometric triangulations"):
  with members:
    - "on simplex pivoting rules and complexity theory"
    - "counting plane graphs cross graph charging schemes"
    - "how many potatoes are in a mesh"
    - "counting plane graphs perfect matchings spanning cycles and kasteleyn s technique"
    - "bounds on the maximum multiplicity of some common geometric graphs"

Connected through hyperedge HE-7 (induced by source paper "geometric biplane graphs i maximal graphs"):
  with members:
    - "geometric biplane graphs ii graph augmentation"
    - "counting plane graphs flippability and its applications"
    - "testing bipartiteness of geometric intersection graphs"

Connected through hyperedge HE-8 (induced by source paper "packing plane perfect matchings into a point set"):
  with members:
    - "packing plane spanning trees and paths in complete geometric graphs"
    - "bichromatic compatible matchings"

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.DM(Discrete Mathematics)