E. Andruchow

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math.OA2025

The Riemann sphere of a C*-algebra

Esteban Andruchow, Gustavo Corach, LÃ¡zaro Recht +1

Given the unital C $^{*}$ -algebra $A$ , the unitary orbit of the projector $p_{0} = (1000)$ in the C $^{*}$ -algebra $M_{2} (A)$ of $2 \times 2$ matrices with…

math.OA2025

The C $^{*}$ -algebra of a composition reflection

Esteban Andruchow

We study the C $^{*}$ algebra generated by the composition operator $C_{a}$ acting on the Hardy space $H^{2}$ of the unit disk, given by $C_{a} f = f \circ I ¨ _{a}$ , where $$ Ï_a(z)=\frac{a-z}{1-\…

The Riemann sphere of a C*-algebra

The C∗-algebra of a composition reflection

The C $^{*}$ -algebra of a composition reflection