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"black box" preconditioner for shifted linear systems?

Computational Science Asked by deasmhumnha on January 11, 2021

Does anyone know of any strategies for creating a preconditioner $P^{-1}_sigma approx (A+sigma I)^{-1}$ given a preconditioner $P^{-1} approx A^{-1}$, preferably such that the precomputation doesn’t depend on the value of $sigma$?

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