On Multiplicative Lebesgue Integration and Families of Evolution Operators.
On sequences off linear functionals and some operators of the class .
On strongly stable approximations.
In this paper we prove that the convergence of (T - Tn)Tn-k to zero in operator norm (plus some technical conditions) is a sufficient condition for Tn to be a strongly stable approximation to T, thus extending some previous results existing in the literature.
On the approximation numbers of large Toeplitz matrices.
On the method of least squares of finding eigenvalues and eigenfunctions of some symmetric operators. II.
On λ-commuting operators
For a scalar λ, two operators T and S are said to λ-commute if TS = λST. In this note we explore the pervasiveness of the operators that λ-commute with a compact operator by characterizing the closure and the interior of the set of operators with this property.
Optimal order of convergence for stable evaluation of differential operators.