Corrigendum to "Inverse Problems for abstract evolution equations II: higher order differentiability for viscoelasticity

In our paper [SIAM J.\ Appl.~Math.\ 79-6 (2019), https://doi.org/10.1137/19M1269403] we considered full waveform inversion (FWI) in the viscoelastic regime. FWI entails the nonlinear inverse problem of recovering parameter functions of the viscoelastic wave equation from partial measurements of reflected wave fields. We have obtained explicit analytic expressions for the first and second order Fréchet derivatives and their adjoints (adjoint wave equations) of the underlying parameter-to-solution map. In the present manuscript we correct an error which occurred in a basic result and thus affected several other statements, which we have also corrected.

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