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• W2978088892 abstract "The backwards diffusion equation is one of the classical ill-posed inverse problems, related to a wide range of applications, and has been extensively studied over the last 50 years. One of the first methods was that of {it quasireversibility/} whereby the parabolic operator is replaced by a differential operator for which the backwards problem in time is well posed. This is in fact the direction we will take but will do so with a nonlocal operator; an equation of fractional order in time for which the backwards problem is known to be ``almost well posed.'' We shall look at various possible options and strategies but our conclusion for the best of these will exploit the linearity of the problem to break the inversion into distinct frequency bands and to use a different fractional order for each. The fractional exponents will be chosen using the discrepancy principle under the assumption we have an estimate of the noise level in the data. An analysis of the method is provided as are some illustrative numerical examples." @default.
• W2978088892 created "2019-10-10" @default.
• W2978088892 creator A5011058927 @default.
• W2978088892 creator A5088154743 @default.
• W2978088892 date "2019-10-05" @default.
• W2978088892 modified "2023-10-16" @default.
• W2978088892 title "Regularization of a backwards parabolic equation by fractional operators" @default.
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• W2978088892 hasPublicationYear "2019" @default.
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