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math.NA2024
A τ Matrix Based Approximate Inverse Preconditioning for Tempered Fractional Diffusion Equations
Xuan Zhang, Chaojie Wang, Haiyu Liu
Tempered fractional diffusion equations are a crucial class of equations widely applied in many physical fields. In this paper, the Crank-Nicolson method and the tempered weighted…
math.NA2024
Permuted preconditioning for extended saddle point problem arising from Neumann boundary control
Chaojie Wang, Xuan Zhang, Xingding Chen
In this paper, a new block preconditioner is proposed for the saddle point problem arising from the Neumann boundary control problem. In order to deal with the singularity of the s…