Enrico Boasso

collaborators

5 papers

math.FA2016

Joint spectra of the tensor product representation of the direct sum of two solvable Lie algebras

Enrico Boasso

Given two complex Banach spaces $X_{1}$ and $X_{2}$ , a tensor product $X_{1} \otimes ~ X_{2}$ of $X_{1}$ and $X_{2}$ in the sense of [14], two complex solvable finite dimensional Lie alge…

math.FA2014

On Cartan Joint Spectra

Enrico Boasso

In this work several results regarding the Cartan version of the Taylor, the Slodkowski, the Fredholm, the split and the Fredholm split joint spectra will be studied.

math.FA2014

The Drazin spectrum of tensor product of Banach algebra elements and elementary operators

Enrico Boasso

Given unital Banach algebras $A$ and $B$ and elements $a \in A$ and $b \in B$ , the Drazin spectrun of $a \otimes b \in A \otimes B$ will be fully characterized, where $A\over…

math.FA2014

Characterizations of Fredholm pairs and chains in Hilbert spaces

Enrico Boasso

In this work characterizations of Fredholm pairs and chains of Hilbert space operators are given. Following a well-known idea of several variable operator theory in Hilbert spaces,…

math.FA2014

Isolated spectral points and Koliha-Drazin invertible elements in quotient Banach algebras and homomorphism ranges

Enrico Boasso

In this article poles, isolated spectral points, group, Drazin and Koliha-Drazin invertible elements in the context of quotient Banach algebras or in ranges of (not necessarily con…