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: "fempar an object oriented parallel finite element framework"
  Abstract: FEMPAR is an open source object oriented Fortran200X scientific software library for the high-performance scalable simulation of complex multiphysics problems governed by partial differential equations at large scales, by exploiting state-of-the-art supercomputing resources. It is a highly modularized, flexible, and extensible library, that provides a set of modules that can be combined to carry out the different steps of the simulation pipeline. FEMPAR includes a rich set of algorithms for the discretization step, namely (arbitrary-order) grad, div, and curl-conforming finite element methods, discontinuous Galerkin methods, B-splines, and unfitted finite element techniques on cut cells, combined with $h$-adaptivity. The linear solver module relies on state-of-the-art bulk-asynchronous implementations of multilevel domain decomposition solvers for the different discretization alternatives and block-preconditioning techniques for multiphysics problems. FEMPAR is a framework that provides users with out-of-the-box state-of-the-art discretization techniques and highly scalable solvers for the simulation of complex applications, hiding the dramatic complexity of the underlying algorithms. But it is also a framework for researchers that want to experience with new algorithms and solvers, by providing a highly extensible framework. In this work, the first one in a series of articles about FEMPAR, we provide a detailed introduction to the software abstractions used in the discretization module and the related geometrical module. We also provide some ingredients about the assembly of linear systems arising from finite element discretizations, but the software design of complex scalable multilevel solvers is postponed to a subsequent work.

Connected through hyperedge HE-1 (induced by source paper "a generic finite element framework on parallel tree based adaptive meshes"):
  with members:
    - "scalable algorithms for parallel tree based adaptive mesh refinement with general element types"
    - "the aggregated unfitted finite element method for elliptic problems"
    - "simulation of high temperature superconductors and experimental validation"
    - "a tetrahedral space filling curve for nonconforming adaptive meshes"

Connected through hyperedge HE-2 (induced by source paper "maximum principle preserving space time isogeometric analysis"):
  with members:
    - "differentiable monotonicity preserving schemes for discontinuous galerkin methods on arbitrary meshes"
    - "monotonicity preserving finite element schemes based on differentiable nonlinear stabilization"

Connected through hyperedge HE-3 (induced by source paper "distributed memory parallelization of the aggregated unfitted finite element method"):
  with members:
    - "the aggregated unfitted finite element method for elliptic problems"
    - "extreme scale multigrid components within petsc"

Connected through hyperedge HE-4 (induced by source paper "scalable solvers for complex electromagnetics problems"):
  with members:
    - "simulation of high temperature superconductors and experimental validation"

Connected through hyperedge HE-5 (induced by source paper "a scalable parallel finite element framework for growing geometries application to metal additive manufacturing"):
  with members:
    - "a generic finite element framework on parallel tree based adaptive meshes"
    - "numerical modelling of heat transfer and experimental validation in powder bed fusion with the virtual domain approximation"
    - "the aggregated unfitted finite element method for elliptic problems"
    - "space time balancing domain decomposition"
    - "morton curve segments produce no more than two distinct face connected subdomains"
    - "recursive algorithms for distributed forests of octrees"
    - "locality and bounding box quality of two dimensional space filling curves"

Connected through hyperedge HE-6 (induced by source paper "numerical modelling of heat transfer and experimental validation in powder bed fusion with the virtual domain approximation"):
  with members:
    - "a scalable parallel finite element framework for growing geometries application to metal additive manufacturing"

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.CE(Computational Engineering, Finance, and Science)