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: "solver composition across the pde linear algebra barrier"
  Abstract: The efficient solution of discretizations of coupled systems of partial differential equations (PDEs) is at the core of much of numerical simulation. Significant effort has been expended on scalable algorithms to precondition Krylov iterations for the linear systems that arise. With few exceptions, the reported numerical implementation of such solution strategies is specific to a particular model setup, and intimately ties the solver strategy to the discretization and PDE, especially when the preconditioner requires auxiliary operators. In this paper, we present recent improvements in the Firedrake finite element library that allow for straightforward development of the building blocks of extensible, composable preconditioners that decouple the solver from the model formulation. Our implementation extends the algebraic composability of linear solvers offered by the PETSc library by augmenting operators, and hence preconditioners, with the ability to provide any necessary auxiliary operators. Rather than s...

Connected through hyperedge HE-1 (induced by source paper "slate extending firedrake s domain specific abstraction to hybridized solvers for geoscience and beyond"):
  with members:
    - "tsfc a structure preserving form compiler"
    - "firedrake automating the finite element method by composing abstractions"
    - "high level implementation of geometric multigrid solvers for finite element problems applications in atmospheric modelling"
    - "dolfin automated finite element computing"

Connected through hyperedge HE-2 (induced by source paper "a study of vectorization for matrix free finite element methods"):
  with members:
    - "tsfc a structure preserving form compiler"
    - "fast matrix free evaluation of discontinuous galerkin finite element operators"
    - "loo py transformation based code generation for gpus and cpus"
    - "finite element integration on gpus"

Connected through hyperedge HE-3 (induced by source paper "code generation for generally mapped finite elements"):
  with members:
    - "a domain specific language for the hybridization and static condensation of finite element methods"
    - "tsfc a structure preserving form compiler"
    - "firedrake automating the finite element method by composing abstractions"
    - "exposing and exploiting structure optimal code generation for high order finite element methods"
    - "an algorithm for the optimization of finite element integration loops"
    - "unified form language a domain specific language for weak formulations of partial differential equations"

Connected through hyperedge HE-4 (induced by source paper "a domain specific language for the hybridization and static condensation of finite element methods"):
  with members:
    - "tsfc a structure preserving form compiler"
    - "firedrake automating the finite element method by composing abstractions"
    - "high level implementation of geometric multigrid solvers for finite element problems applications in atmospheric modelling"

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.MS(Mathematical Software)