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 planar directed k vertex disjoint paths problem is fixed parameter tractable"
  Abstract: Given a graph G and k pairs of vertices (s_1,t_1), ..., (s_k,t_k), the k-Vertex-Disjoint Paths problem asks for pairwise vertex-disjoint paths P_1, ..., P_k such that P_i goes from s_i to t_i. Schrijver [SICOMP'94] proved that the k-Vertex-Disjoint Paths problem on planar directed graphs can be solved in time n^{O(k)}. We give an algorithm with running time 2^{2^{O(k^2)}} n^{O(1)} for the problem, that is, we show the fixed-parameter tractability of the problem.

Connected through hyperedge HE-1 (induced by source paper "a relaxation of the directed disjoint paths problem a global congestion metric helps"):
  with members:
    - "dual parameterization of weighted coloring"
    - "the complexity landscape of fixed parameter directed steiner network problems"
    - "routing with congestion in acyclic digraphs"
    - "the directed grid theorem"
    - "network sparsification for steiner problems on planar and bounded genus graphs"
    - "fixed parameter tractability of multicut in directed acyclic graphs"
    - "parameterized complexity of directed steiner tree on sparse graphs"
    - "fixed parameter tractability of directed multiway cut parameterized by the size of the cutset"

Connected through hyperedge HE-2 (induced by source paper "parametrised algorithms for directed modular width"):
  with members:
    - "on directed feedback vertex set parameterized by treewidth"
    - "an algorithmic metatheorem for directed treewidth"
    - "the directed grid theorem"
    - "parameterized algorithms for modular width"
    - "finding an induced subdivision of a digraph"
    - "finding topological subgraphs is fixed parameter tractable"

Connected through hyperedge HE-3 (induced by source paper "hitting topological minor models in planar graphs is fixed parameter tractable"):
  with members:
    - "obtaining planarity by contracting few edges"
    - "finding topological subgraphs is fixed parameter tractable"
    - "obtaining a planar graph by vertex deletion"

Connected through hyperedge HE-4 (induced by source paper "walking through waypoints"):
  with members:
    - "virtual network embedding approximations leveraging randomized rounding"
    - "approximate and incremental network function placement"
    - "an approximation algorithm for path computation and function placement in sdns"
    - "new algorithms for maximum disjoint paths based on tree likeness"
    - "service chain and virtual network embeddings approximations using randomized rounding"
    - "online admission control and embedding of service chains"
    - "on routing disjoint paths in bounded treewidth graphs"
    - "vertex disjoint path in upward planar graphs"

Connected through hyperedge HE-5 (induced by source paper "routing with congestion in acyclic digraphs"):
  with members:
    - "congestion free rerouting of flows on dags"
    - "vertex disjoint path in upward planar graphs"
    - "a polylogarithimic approximation algorithm for edge disjoint paths with congestion 2"

Connected through hyperedge HE-6 (induced by source paper "towards single face shortest vertex disjoint paths in undirected planar graphs"):
  with members:
    - "shortest vertex disjoint two face paths in planar graphs"

Connected through hyperedge HE-7 (induced by source paper "the directed grid theorem"):
  with members:
    - "bidimensionality and kernels"
    - "polynomial bounds for the grid minor theorem"
    - "directed nowhere dense classes of graphs"
    - "bidimensionality and eptas"
    - "finding topological subgraphs is fixed parameter tractable"
    - "on brambles grid like minors and parameterized intractability of monadic second order logic"

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.DM(Discrete Mathematics)