Ivan S. Feshchenko

Available identifiers

zbMath Open feshchenko.ivan-sMaRDI QIDQ380294

List of research outcomes

Publication	Date of Publication	Type
On the closedness of the sum of subspaces of the space $B(H,Y)$ consisting of operators whose kernels contain given subspaces of $H$	2023-11-09	Paper
When is the sum of closed subspaces of a Hilbert space closed?	2020-12-15	Paper
When is the sum of complemented subspaces complemented?	2020-03-10	Paper
On the inverse best approximation property of systems of subspaces of a Hilbert space	2020-02-05	Paper
On the optimal error bound for the first step in the method of cyclic alternating projections	2019-08-01	Paper
A sufficient condition for the sum of complemented subspaces to be complemented	2019-06-19	Paper
On the closedness of the sum of ranges of operators \(A_k\) with almost compact products \(A_i^\ast A_j\)	2014-08-29	Paper
On the essential spectrum of the sum of self-adjoint operators and the closedness of the sum of operator ranges	2013-11-13	Paper
Systems of subspaces in Hilbert space that obey certain conditions, on their pairwise angles	2013-09-17	Paper
On closedness of the sum of \(n\) subspaces of a Hilbert space	2012-11-23	Paper
On the divergence of series of the form \sum_{k=1}^\infty\|A_k x\|^p	2012-08-09	Paper
On absolutely representing families of subspaces in Banach spaces	2012-06-24	Paper
On systems of subspaces of a Hilbert space such that every pair of subspaces satisfies one of the angle or commutativity condition	2012-01-17	Paper
On representing and absolutely representing systems of subspaces in Banach spaces	2012-01-05	Paper
On the divergence of series of p-th powers of operator norms	2012-01-05	Paper
Dissecting a brick into bars	2010-04-15	Paper

Research outcomes over time

Doctoral students

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Known relations from the MaRDI Knowledge Graph

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MaRDI profile type	MaRDI person profile
instance of	human

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