New posts in Banach Algebras

Operator that commutes with projections

Non-density of invertible elements in $\ell_1(\mathbb{N}_0)$

Conceptually, what does unitization do?

is every element in a C* algebra a product of normal elements?

$\mathbb{Z}G$ (left) Noetherian$\Rightarrow$ $\ell^1(G)$ is a flat (right) $\mathbb{Z}G$-module?

Spectra of elements of a Banach algebra and the role played by the Hahn-Banach Theorem.

Which Banach algebras are group algebras?

In a Banach algebra, do ab and ba have almost the same exponential spectrum?