On continuity of linear transformations commuting with generalized scalar operators (Preliminary communication)
On continuity of linear transformations commuting with generalized scalar operators in Banach space
On contractions in
On contradictions of normed vector spaces
On convergence of iterates of the Frobenius-Perron operator for expanding mappings
On coupling constant thresholds and related eigenvalue properties of Dirac operators.
On Cusp Forms in Character Varieties.
On where has infinitely many “bumps”
On Davis-Kahan-weinberger Extension Theorem
On decomposably regular operators.
On decomposition of pairs of commuting isometries
A review of known decompositions of pairs of isometries is given. A new, finer decomposition and its properties are presented.
On Deddens΄s Theorem
On determination of eigenvalues and eigenvectors of selfadjoint operators
Two simple methods for approximate determination of eigenvalues and eigenvectors of linear self-adjoint operators are considered in the following two cases: (i) lower-upper bound of the spectrum of is an isolated point of ; (ii) (not necessarily an isolated point of with finite multiplicity) is an eigenvalue of .
On different products of closed operators.
On Dominant Operators.
On Dominating Sequences in the Unit Disc.
On E. Borel's Theorem.
On eigenfunction expansions and scattering theory.
On Erb's uncertainty principle
We improve a result of Erb, concerning an uncertainty principle for orthogonal polynomials. The proof uses numerical range and a decomposition of some multiplication operators as a difference of orthogonal projections.
On ergodic properties of convolution operators associated with compact quantum groups
Recent results of M. Junge and Q. Xu on the ergodic properties of the averages of kernels in noncommutative -spaces are applied to the analysis of almost uniform convergence of operators induced by convolutions on compact quantum groups.