18 citations · 19 across the 12 of their papers we have counts for
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math.FA2016
Approximation by partial isometries and symmetric approximation of finite frames
Jorge Antezana, Eduardo Chiumiento
We solve the problem of best approximation by partial isometries of given rank to an arbitrary rectangular matrix, when the distance is measured in any unitarily invariant norm. In…
math.FA2016
Geometric significance of Toeplitz kernels
Esteban Andruchow, Eduardo Chiumiento, Gabriel Larotonda
Let be the Lebesgue space of square-integrable functions on the unit circle. We show that the injectivity problem for Toeplitz operators is linked to the existence of geodesi…