نتایج جستجو برای: invariant subspaces

تعداد نتایج: 83743  

Journal: :bulletin of the iranian mathematical society 0
h. larki islamic azad university, parand branch a. riazi amirkabir university of technology

let a be a bounded linear operator on a banach space x. we investigate the conditions of existing rank-one operator b such that i+f(a)b is invertible for every analytic function f on sigma(a). also we compare the invariant subspaces of f(a)b and b. this work is motivated by an operator method on the banach space ell^2 for solving some pdes which is extended to general operator space under some ...

R. Raisi Tousi, R.A. Kamyabi Gol,

We investigate shift invariant subspaces of $L^2(G)$, where $G$ is a locally compact abelian group. We show that every shift invariant space can be decomposed as an orthogonal sum of spaces each of which is generated by a single function whose shifts form a Parseval frame. For a second countable locally compact abelian group $G$ we prove a useful Hilbert space isomorphism, introduce range funct...

Journal: :Advances in Mathematics 1976

Journal: :Proceedings of the American Mathematical Society 1969

Journal: :bulletin of the iranian mathematical society 2015
l. livshits

the main result of this article is that for collections of entry-wise non-negative matrices the property of possessing a standard triangularization is stable under approximation. the methodology introduced to prove this result allows us to offer quick proofs of the corresponding results of [b. r. yahaghi, near triangularizability implies triangularizability, canad. math. bull. 47, (2004), no. 2...

Journal: :Pacific Journal of Mathematics 1964

Journal: :Tohoku Mathematical Journal 1967

Journal: :Pacific Journal of Mathematics 1968

Journal: :Pacific Journal of Mathematics 1977

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