Schubert decompositions for ind-varieties of generalized flags

Lucas Fresse, Ivan Penkov

Let $\mathbf{G}$ be one of the ind-groups $GL(\infty )$, $O(\infty )$, $Sp(\infty )$ and $\mathbf{P}\subset \mathbf{G}$ be a splitting parabolic ind-subgroup. The ind-variety $\mathbf…