New posts in c-star-algebras

Consequence of Hahn-Banach - norm closed convex hull contains $0$

Why is every positive linear map between $C^*$-algebras bounded?

Gelfand-Naimark Theorem

Topological vs. Algebraic $K$-Theory

Cayley transform is well-defined

$C^*$-algebra which is also a Hilbert space?

Why is $\ell^1(\mathbb{Z})$ not a $C^{*}$-algebra?

Consequences of Proposition 1.1 on Semi-inner-product $A$-modules

Takesaki lemma 4.5

What does countable weakly unperforated $\textbf{simple}$ ordered group mean here?

An application of Hahn-Banach theorem in the context of $C^{\ast}$-algebra.

Restriction of state on unitisation

Is $\|\varphi\| = \|\varphi p\| + \|\varphi(1-p)\|$?.

Jordan decomposition in Takesaki: theorem III.2.2.1

Nuclearity of finite dimensional $C^*$-algebras

How to understand what a 'noncommutative space' is