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: "improved approximation algorithms for geometric set cover"
  Abstract: Given a collection S of subsets of some set U, and M a subset of U, the set cover problem is to find the smallest subcollection C of S such that M is a subset of the union of the sets in C. While the general problem is NP-hard to solve, even approximately, here we consider some geometric special cases, where usually U = R^d. Extending prior results, we show that approximation algorithms with provable performance exist, under a certain general condition: that for a random subset R of S and function f(), there is a decomposition of the portion of U not covered by R into an expected f(|R|) regions, each region of a particular simple form. We show that under this condition, a cover of size O(f(|C|)) can be found. Our proof involves the generalization of shallow cuttings to more general geometric situations. We obtain constant-factor approximation algorithms for covering by unit cubes in R^3, for guarding a one-dimensional terrain, and for covering by similar-sized fat triangles in R^2. We also obtain improved approximation guarantees for fat triangles, of arbitrary size, and for a class of fat objects.

Connected through hyperedge HE-1 (induced by source paper "the epsilon t net problem"):
  with members:
    - "epsilon approximations and epsilon nets"
    - "tight lower bounds for the size of epsilon nets"

Connected through hyperedge HE-2 (induced by source paper "algorithms for intersection graphs of multiple intervals and pseudo disks"):
  with members:
    - "on approximating partial set cover and generalizations"
    - "on pseudo disk hypergraphs"
    - "epsilon approximations and epsilon nets"
    - "on partial covering for geometric set systems"
    - "approximation schemes for independent set and sparse subsets of polygons"
    - "approximation schemes for maximum weight independent set of rectangles"
    - "approximation algorithms for maximum independent set of pseudo disks"
    - "a new multilayered pcp and the hardness of hypergraph vertex cover"

Connected through hyperedge HE-3 (induced by source paper "approximability of covering cells with line segments"):
  with members:
    - "approximating dominating set on intersection graphs of rectangles and l frames"
    - "line segment covering of cells in arrangements"
    - "covering segments with unit squares"
    - "approximation schemes for covering and packing"
    - "coloring and guarding arrangements"
    - "approximation algorithms for maximum independent set of pseudo disks"

Connected through hyperedge HE-4 (induced by source paper "computing coverage kernels under restricted settings"):
  with members:
    - "depth distribution in high dimensions"
    - "minimum weight triangulation is np hard"
    - "the problem of compatible representatives"

Connected through hyperedge HE-5 (induced by source paper "altitude terrain guarding and guarding uni monotone polygons"):
  with members:
    - "the continuous 1 5d terrain guarding problem discretization optimal solutions and ptas"
    - "terrain visibility with multiple viewpoints"

Connected through hyperedge HE-6 (induced by source paper "capacitated covering problems in geometric spaces"):
  with members:
    - "replica placement on bounded treewidth graphs"
    - "iterative partial rounding for vertex cover with hard capacities"
    - "capacitated dominating set on planar graphs"
    - "tight algorithms for vertex cover with hard capacities on multigraphs and hypergraphs"
    - "on uniform capacitated k median beyond the natural lp relaxation"
    - "lp based algorithms for capacitated facility location"
    - "analytical approach to parallel repetition"
    - "lp rounding for k centers with non uniform hard capacities"

Connected through hyperedge HE-7 (induced by source paper "epsilon approximations and epsilon nets"):
  with members:
    - "near optimal epsilon kernel construction and related problems"
    - "a size sensitive discrepancy bound for set systems of bounded primal shatter dimension"
    - "small strong epsilon nets"
    - "constructive discrepancy minimization by walking on the edges"
    - "a unified framework for approximating and clustering data"
    - "tight lower bounds for the size of epsilon nets"
    - "improved approximation for guarding simple galleries from the perimeter"
    - "algorithms for eps approximations of terrains"

Connected through hyperedge HE-8 (induced by source paper "finding hitting and packing cycles in subexponential time on unit disk graphs"):
  with members:
    - "subexponential parameterized algorithms for planar and apex minor free graphs via low treewidth pattern covering"
    - "bidimensionality and kernels"
    - "approximation algorithms for polynomial expansion and low density graphs"
    - "mixing color coding related techniques"
    - "bidimensionality and geometric graphs"
    - "narrow sieves for parameterized paths and packings"
    - "bidimensionality and eptas"
    - "minimum clique partition in unit disk graphs"

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)