Abstract
We obtain direct and inverse theorems on the approximation of solutions of self-adjoint boundary-value problems for the Sturm-Liouville equation on a finite interval by the Ritz method.
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Yakymiv, R.Y. On the rate of convergence of the Ritz method for ordinary differential equations. Ukr Math J 52, 803–808 (2000). https://doi.org/10.1007/BF02487290
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DOI: https://doi.org/10.1007/BF02487290