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: "quasi matrix free hybrid multigrid on dynamically adaptive cartesian grids"
  Abstract: We present a family of spacetree-based multigrid realizations using the tree’s multiscale nature to derive coarse grids. They align with matrix-free geometric multigrid solvers as they never assemble the system matrices, which is cumbersome for dynamically adaptive grids and full multigrid. The most sophisticated realizations use BoxMG to construct operator-dependent prolongation and restriction in combination with Galerkin/Petrov-Galerkin coarse-grid operators. This yields robust solvers for nontrivial elliptic problems. We embed the algebraic, problem-dependent, and grid-dependent multigrid operators as stencils into the grid and evaluate all matrix-vector products in situ throughout the grid traversals. Such an approach is not literally matrix-free as the grid carries the matrix. We propose to switch to a hierarchical representation of all operators. Only differences of algebraic operators to their geometric counterparts are held. These hierarchical differences can be stored and exchanged with small memory footprint. Our realizations support arbitrary dynamically adaptive grids while they vertically integrate the multilevel operations through spacetree linearization. This yields good memory access characteristics, while standard colouring of mesh entities with domain decomposition allows us to use parallel many-core clusters. All realization ingredients are detailed such that they can be used by other codes.

Connected through hyperedge HE-1 (induced by source paper "the peano software parallel automaton based dynamically adaptive grid traversals"):
  with members:
    - "stop talking to me a communication avoiding ader dg realisation"
    - "complex additive geometric multilevel solvers for helmholtz equations on spacetrees"
    - "two particle in grid realisations on spacetrees"
    - "algebraic geometric matrix free multigrid on dynamically adaptive cartesian meshes"
    - "how many three dimensional hilbert curves are there"
    - "morton curve segments produce no more than two distinct face connected subdomains"
    - "bounds on the number of discontinuities of morton type space filling curves"
    - "a survey of high level frameworks in block structured adaptive mesh refinement packages"

Connected through hyperedge HE-2 (induced by source paper "dynamically adaptive fas for an additively damped afac variant"):
  with members:
    - "the peano software parallel automaton based dynamically adaptive grid traversals"
    - "a survey of high level frameworks in block structured adaptive mesh refinement packages"

Connected through hyperedge HE-3 (induced by source paper "exahype an engine for parallel dynamically adaptive simulations of wave problems"):
  with members:
    - "the peano software parallel automaton based dynamically adaptive grid traversals"
    - "two particle in grid realisations on spacetrees"

Connected through hyperedge HE-4 (induced by source paper "enclave tasking for discontinuous galerkin methods on dynamically adaptive meshes"):
  with members:
    - "exahype an engine for parallel dynamically adaptive simulations of wave problems"
    - "stop talking to me a communication avoiding ader dg realisation"
    - "fast matrix free evaluation of discontinuous galerkin finite element operators"
    - "asynchronous mpi for the masses"
    - "likwid a lightweight performance oriented tool suite for x86 multicore environments"
    - "likwid a lightweight performance oriented tool suite for x86 multicore environments"

Connected through hyperedge HE-5 (induced by source paper "stop talking to me a communication avoiding ader dg realisation"):
  with members:
    - "the peano software parallel automaton based dynamically adaptive grid traversals"
    - "communication reducing algorithms for distributed hierarchical n body problems with boundary distributions"
    - "likwid a lightweight performance oriented tool suite for x86 multicore environments"
    - "likwid a lightweight performance oriented tool suite for x86 multicore environments"

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.NA(Numerical Analysis)