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: "minimum dilation stars"
  Abstract: The dilation of a Euclidean graph is defined as the ratio of distance in the graph divided by distance in R^d. In this paper we consider the problem of positioning the root of a star such that the dilation of the resulting star is minimal. We present a deterministic O(nlogn)-time algorithm for evaluating the dilation of a given star; a randomized O(nlogn) expected-time algorithm for finding an optimal center in R^d; and for the case d=2, a randomized O(n2^@a^(^n^)log^2n) expected-time algorithm for finding an optimal center among the input points.

Connected through hyperedge HE-1 (induced by source paper "distribution sensitive construction of the greedy spanner"):
  with members:
    - "computing the greedy spanner in linear space"
    - "on the expected maximum degree of gabriel and yao graphs"

Connected through hyperedge HE-2 (induced by source paper "single source dilation bounded minimum spanning trees"):
  with members:
    - "computing a minimum dilation spanning tree is np hard"

Connected through hyperedge HE-3 (induced by source paper "optimal embedding into star metrics"):
  with members:
    - "computing a minimum dilation spanning tree is np hard"

Connected through hyperedge HE-4 (induced by source paper "dilation smoothed distance and minimization diagrams of convex functions"):
  with members:
    - "algorithms for drawing media"

Connected through hyperedge HE-5 (induced by source paper "moving walkways escalators and elevators"):
  with members:
    - "constructing optimal highways"
    - "optimal point placement for mesh smoothing"

Connected through hyperedge HE-6 (induced by source paper "sparse geometric graphs with small dilation"):
  with members:
    - "computing a minimum dilation spanning tree is np hard"

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)