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Semi matrix-free twogrid shifted Laplacian preconditioner for the Helmholtz equation with near optimal shifts.
Daniel Drzisga
Tobias Köppl
Barbara I. Wohlmuth
Published in:
CoRR (2021)
Keyphrases
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matrix inversion
square root
edge preserving
numerical solution
iterative methods
singular value decomposition
low rank
linear algebra
laplacian matrix
spectral decomposition
multiscale
image restoration
mathematical model
high order
low frequency
numerical methods