An application of approximation theory by nonlinear manifolds in Sturm–Liouville inverse problems

Amadeo Irigoyen
2007 Inverse Problems  
We give here some negative results in Sturm-Liouville inverse theory, meaning that we cannot approach any of the potentials with $m+1$ integrable derivatives on $\mathbb{R}^+$ by an $\omega$-parametric analytic family better than order of $(\omega\ln\omega)^{-(m+1)}$. Next, we prove an estimation of the eigenvalues and characteristic values of a Sturm-Liouville operator and some properties of the solution of a certain integral equation. This allows us to deduce from [Henkin-Novikova] some
more » ... ovikova] some positive results about the best reconstruction formula by giving an almost optimal formula of order of $\omega^{-m}$.
doi:10.1088/0266-5611/23/2/006 fatcat:hh3eiz7mgjbetjnz7edhofioae