SINE, a conjugate-gradient-type shift-and-invert rational Krylov method, is an order-optimal regularizer for linear ill-posed problems and always stops no later than CGNE under the discrepancy principle.
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A conjugate-gradient-type rational Krylov subspace method for ill-posed problems
SINE, a conjugate-gradient-type shift-and-invert rational Krylov method, is an order-optimal regularizer for linear ill-posed problems and always stops no later than CGNE under the discrepancy principle.