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: "sparse geometric graphs with small dilation"
  Abstract: Given a set S of n points in R^D, and an integer k such that 0 <= k < n, we show that a geometric graph with vertex set S, at most n - 1 + k edges, maximum degree five, and dilation O(n / (k+1)) can be computed in time O(n log n). For any k, we also construct planar n-point sets for which any geometric graph with n-1+k edges has dilation Omega(n/(k+1)); a slightly weaker statement holds if the points of S are required to be in convex position.

Connected through hyperedge HE-1 (induced by source paper "a spanner for the day after"):
  with members:
    - "on locality sensitive orderings and their applications"
    - "near optimal o k robust geometric spanners"
    - "robust geometric spanners"

Connected through hyperedge HE-2 (induced by source paper "fault tolerant additive weighted geometric spanners"):
  with members:
    - "on plane constrained bounded degree spanners"
    - "efficient construction of spanners in d dimensions"
    - "from hierarchical partitions to hierarchical covers optimal fault tolerant spanners for doubling metrics"
    - "bounded degree planar geometric spanners"
    - "spanners of additively weighted point sets"
    - "geometric spanners with small chromatic number"
    - "fast construction of nets in low dimensional metrics and their applications"

Connected through hyperedge HE-3 (induced by source paper "lower bounds on the dilation of plane spanners"):
  with members:
    - "degree four plane spanners simpler and better"
    - "the stretch factor of the delaunay triangulation is less than 1 998"
    - "on geometric spanners of euclidean and unit disk graphs"
    - "computing a minimum dilation spanning tree is np hard"

Connected through hyperedge HE-4 (induced by source paper "self approaching graphs"):
  with members:
    - "euclidean greedy drawings of trees"
    - "succinct greedy geometric routing in the euclidean plane"

Connected through hyperedge HE-5 (induced by source paper "robust geometric spanners"):
  with members:
    - "on plane constrained bounded degree spanners"
    - "bounded degree planar geometric spanners"
    - "geometric spanners with small chromatic number"

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)