2 citations · 3 across the 2 of their papers we have counts for
4 papers
Resolvent criteria for similarity to a normal operator with spectrum on a curve
Michael A. Dritschel, Daniel Estévez, Dmitry Yakubovich
We give some new criteria for a Hilbert space operator with spectrum on a smooth curve to be similar to a normal operator, in terms of pointwise and integral estimates of the resol…
Tests for complete -spectral sets
Michael A. Dritschel, Daniel Estévez, Dmitry Yakubovich
Let be a family of functions analytic in some neighborhood of a complex domain , and let be a Hilbert space operator whose spectrum is contained in . Our typ…
Explicit traces of functions on Sobolev spaces and quasi-optimal linear interpolators
Daniel Estévez
Let be a strictly increasing sequence. For , we give a simple explicit expression for an equivalent norm on the trace spaces , of t…
Decay rate estimations for linear quadratic optimal regulators
Daniel Estévez, Dmitry Yakubovich
Let be the optimal control of the open-loop system in a linear quadratic optimization problem. By using different complex variable arguments, we g…