Real group orbits on flag ind-varieties of $\mathrm{SL}(\infty ,\mathbb{C})$

Mikhail V. Ignatyev, Ivan Penkov, Joseph A. Wolf

We consider the complex ind-group $G=\mathrm{SL}(\infty ,\mathbb{C})$ and its real forms $G^0=\mathrm{SU}(\infty ,\infty )$, $\mathrm{SU}(p,\infty )$, $\mathrm{SL}(\infty ,\mathbb{R})$,…