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: "a modulus squared dirichlet boundary condition for time dependent complex partial differential equations and its application to the nonlinear schr odinger equation"
  Abstract: An easy to implement modulus-squared Dirichlet (MSD) boundary condition is formulated for numerical simulations of time-dependent complex partial differential equations in multidimensional settings. The MSD boundary condition approximates a constant modulus-square value of the solution at the boundaries. Application of the MSD boundary condition to the nonlinear Schr\"odinger equation is shown, and numerical simulations are performed to demonstrate its usefulness and advantages over other simple boundary conditions.

Connected through hyperedge HE-1 (induced by source paper "nlsemagic nonlinear schrodinger equation multi dimensional matlab based gpu accelerated integrators using compact high order schemes"):
  with members:
    - "numerical stability of explicit runge kutta finite difference schemes for the nonlinear schr odinger equation"
    - "a two step high order compact scheme for the laplacian operator and its implementation in an explicit method for integrating the nonlinear schr odinger equation"
    - "a performance comparison of cuda and opencl"

Connected through hyperedge HE-2 (induced by source paper "numerical stability of explicit runge kutta finite difference schemes for the nonlinear schr odinger equation"):
  with members:
    - "nlsemagic nonlinear schrodinger equation multi dimensional matlab based gpu accelerated integrators using compact high order schemes"
    - "a two step high order compact scheme for the laplacian operator and its implementation in an explicit method for integrating the nonlinear schr odinger equation"

Connected through hyperedge HE-3 (induced by source paper "a two step high order compact scheme for the laplacian operator and its implementation in an explicit method for integrating the nonlinear schr odinger equation"):
  with members:
    - "nlsemagic nonlinear schrodinger equation multi dimensional matlab based gpu accelerated integrators using compact high order schemes"
    - "numerical stability of explicit runge kutta finite difference schemes for the nonlinear schr odinger equation"

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)