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math-ph2018
Point mass perturbations of spectral measures
Rafael del Rio, Luis O. Silva, Julio H. Toloza
Using a generalization of the moment problem and the extremal properties of spectral measures corresponding to the selfadjoint extensions of a regular symmetric operator, we study…
math-ph2015
On the density of polynomials under perturbations of the measure
Rafael del Rio, Luis O. Silva
This paper presents an erroneous proof that if the polynomials are dense in , then they are dense in where is a measure supported on…