The Riemann sphere of a C*-algebra

Esteban Andruchow, Gustavo Corach, Lázaro Recht +1

Given the unital C${}^{\ast }$-algebra $A$, the unitary orbit of the projector $p_0=\left(\begin{array}{cc}1& 0\\ 0& 0\end{array}\right)$ in the C${}^{\ast }$-algebra $M_2(A)$ of $2\times 2$ matrices with…