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: "the clique problem in ray intersection graphs"
  Abstract: Ray intersection graphs are intersection graphs of rays, or halflines, in the plane. We show that any planar graph has an even subdivision whose complement is a ray intersection graph. The construction can be done in polynomial time and implies that finding a maximum clique in a segment intersection graph is NP-hard. This solves a 21-year old open problem posed by Kratochv\'il and Ne\v{s}et\v{r}il.

Connected through hyperedge HE-1 (induced by source paper "colored ray configurations"):
  with members:
    - "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"
    - "counting triangulations of planar point sets"

Connected through hyperedge HE-2 (induced by source paper "optimality program in segment and string graphs"):
  with members:
    - "planar graphs as l intersection or l contact graphs"
    - "finding hitting and packing cycles in subexponential time on unit disk graphs"
    - "generalized feedback vertex set problems on bounded treewidth graphs chordality is the key to single exponential parameterized algorithms"
    - "approximation schemes for independent set and sparse subsets of polygons"
    - "optimal parameterized algorithms for planar facility location problems using voronoi diagrams"
    - "intersection graphs of segments and exists mathbb r"
    - "quasi polynomial time approximation scheme for sparse subsets of polygons"
    - "a qptas for maximum weight independent set of polygons with polylogarithmically many vertices"

Connected through hyperedge HE-3 (induced by source paper "intersection graphs of rays and grounded segments"):
  with members:
    - "intersection graphs of segments and exists mathbb r"

Connected through hyperedge HE-4 (induced by source paper "the maximum clique problem in multiple interval graphs"):
  with members:
    - "clique in 3 track interval graphs is apx hard"
    - "parameterized complexity in multiple interval graphs domination partition separation irredundancy"

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)