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: "very sparse additive spanners and emulators"
  Abstract: We obtain new upper bounds on the additive distortion for graph emulators and spanners on relatively few edges. We introduce a new subroutine called "strip creation," and we combine this subroutine with several other ideas to obtain the following results: #R##N#\item Every graph has a spanner on $O(n^{1+\epsilon})$ edges with $\tilde{O}(n^{1/2 - \epsilon/2})$ additive distortion, for arbitrary $\epsilon\in [0,1]$. \item Every graph has an emulator on $\tilde{O}(n^{1 + \epsilon})$ edges with $\tilde{O}(n^{1/3 - 2\epsilon/3})$ additive distortion whenever $\epsilon \in [0, \frac{1}{5}]$. \item Every graph has a spanner on $\tilde{O}(n^{1 + \epsilon})$ edges with $\tilde{O}(n^{2/3 - 5\epsilon/3})$ additive distortion whenever $\epsilon \in [0, \frac{1}{4}]$. #R##N#Our first spanner has the new best known asymptotic edge-error tradeoff for additive spanners whenever $\epsilon \in [0, \frac{1}{7}]$. Our second spanner has the new best tradeoff whenever $\epsilon \in [\frac{1}{7}, \frac{3}{17}]$. Our emulator has the new best asymptotic edge-error tradeoff whenever $\epsilon \in [0, \frac{1}{5}]$.

Connected through hyperedge HE-1 (induced by source paper "lower bounds on sparse spanners emulators and diameter reducing shortcuts"):
  with members:
    - "thorup zwick emulators are universally optimal hopsets"
    - "nearly work efficient parallel algorithm for digraph reachability"
    - "a hierarchy of lower bounds for sublinear additive spanners"
    - "linear size distance preservers"
    - "better distance preservers and additive spanners"
    - "the 4 3 additive spanner exponent is tight"
    - "additive spanners a simple construction"

Connected through hyperedge HE-2 (induced by source paper "linear size distance preservers"):
  with members:
    - "thorup zwick emulators are universally optimal hopsets"
    - "distance preserving subgraphs of interval graphs"
    - "multiple source dual fault tolerant bfs trees"
    - "a hierarchy of lower bounds for sublinear additive spanners"
    - "a linear size logarithmic stretch path reporting distance oracle for general graphs"
    - "dual failure resilient bfs structure"
    - "better distance preservers and additive spanners"
    - "sublinear distance labeling for sparse graphs"

Connected through hyperedge HE-3 (induced by source paper "efficient algorithms for constructing very sparse spanners and emulators"):
  with members:
    - "the greedy spanner is existentially optimal"
    - "a hierarchy of lower bounds for sublinear additive spanners"
    - "hopsets with constant hopbound and applications to approximate shortest paths"
    - "distributed strong diameter network decomposition"
    - "a linear size logarithmic stretch path reporting distance oracle for general graphs"
    - "the 4 3 additive spanner exponent is tight"
    - "an entropy based proof for the moore bound for irregular graphs"
    - "parallel graph decompositions using random shifts"

Connected through hyperedge HE-4 (induced by source paper "a hierarchy of lower bounds for sublinear additive spanners"):
  with members:
    - "hopsets with constant hopbound and applications to approximate shortest paths"
    - "a linear size logarithmic stretch path reporting distance oracle for general graphs"
    - "better distance preservers and additive spanners"
    - "the 4 3 additive spanner exponent is tight"
    - "additive spanners a simple construction"
    - "bypassing erd h o s girth conjecture hybrid stretch and sourcewise spanners"
    - "on pairwise spanners"
    - "on the hardness of distance oracle for sparse graph"

Connected through hyperedge HE-5 (induced by source paper "better distance preservers and additive spanners"):
  with members:
    - "the greedy spanner is existentially optimal"
    - "a hierarchy of lower bounds for sublinear additive spanners"
    - "linear size distance preservers"
    - "a linear size logarithmic stretch path reporting distance oracle for general graphs"
    - "additive spanners a simple construction"
    - "on pairwise spanners"
    - "nearly linear time algorithms for graph partitioning graph sparsification and solving linear systems"

Connected through hyperedge HE-6 (induced by source paper "the 4 3 additive spanner exponent is tight"):
  with members:
    - "a hierarchy of lower bounds for sublinear additive spanners"
    - "linear size distance preservers"
    - "better distance preservers and additive spanners"
    - "additive spanners a simple construction"
    - "bypassing erd h o s girth conjecture hybrid stretch and sourcewise spanners"
    - "on pairwise spanners"
    - "collective additive tree spanners of bounded tree breadth graphs with generalizations and consequences"

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.DS(Data Structures and Algorithms)