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- S. Saeidi, Heydar Radjavi
- 2011

We introduce an iterative algorithm for finding a common element of the set of fixed points for an infinite family of nonexpansive mappings, the set of solutions of the variational inequalities for aâ€¦ (More)

- VICTOR I. LOMONOSOV, Heydar Radjavi, VLADIMIR G. TROITSKY, V. G. TROITSKY
- 2008

An algebra of operators on a Banach space X is said to be transitive if X has no nontrivial closed subspaces invariant under every member of the algebra. In this paper we investigate a number ofâ€¦ (More)

- HAILEGEBRIEL GESSESSE, Alexey Popov, Heydar Radjavi, EUGENIU SPINU, VLADIMIR G. TROITSKY, V. G. TROITSKY
- 2010

A semigroup S of non-negative nÃ— n matrices is indecomposable if for every pair i, j 6 n there exists S âˆˆ S such that (S)ij 6= 0. We show that if there is a pair k, l such that {(S)kl : S âˆˆ S} isâ€¦ (More)

We investigate algebraic and topological transitivity and, more generally, k-transitivity for linear spaces of operators. In finite dimensions, we determine minimal dimensions of k-transitive spacesâ€¦ (More)

- Magdalena C. Georgescu, Heydar Radjavi, Bujor Georgescu
- 2006

This is an expository thesis which addresses the requirements for an operator algebra to be similar to a Câˆ—-algebra. It has been conjectured that this similarity condition is equivalent to eitherâ€¦ (More)

- Heydar Radjavi, VLADIMIR G. TROITSKY, V. G. TROITSKY
- 2008

A collection S of linear maps on a vector space X is strictly semitransitive if for every two vectors x, y there is A âˆˆ S such that Ax = y or Ay = x. There is also a topological version of thisâ€¦ (More)

- JANEZ BERNIK, Mitja Mastnak, Heydar Radjavi
- 2007

Let B(X) be the algebra of bounded operators on a complex Banach space X. Viewing B(X) as an algebra over R, we study the structure of those irreducible subalgebras which contain nonzero compactâ€¦ (More)

Let S be a multiplicative semigroup of matrices with nonnegative entries. Assume that the diagonal entries of the members of S form a finite set. This paper is concerned with the following question:â€¦ (More)

- Heydar Radjavi, VLADIMIR G. TROITSKY, V. G. TROITSKY
- 2009

This paper is concerned with the problem of existence of invariant sublattices for a positive matrix or a positive operator on Lp(Î¼). Common invariant sublattices for certain semigroups of positiveâ€¦ (More)

It is shown that a transitive, closed, homogeneous semigroup of linear transformations on a finite-dimensional space either has zero divisors or is simultaneously similar to a group consisting ofâ€¦ (More)