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math.RT2021
Totally nonnegative Grassmannians, Grassmann necklaces and quiver Grassmannians
Evgeny Feigin, Martina Lanini, Alexander Pütz
Postnikov constructed a cellular decomposition of the totally nonnegative Grassmannians. The poset of cells can be described (in particular) via Grassmann necklaces. We study certa…
math.RT2021
Permutation actions on Quiver Grassmannians for the equioriented cycle via GKM-Theory
Martina Lanini, Alexander Pütz
In previous work we equipped quiver Grassmannians for nilpotent representations of the equioriented cycle with an action of an algebraic torus. We show here that the equivariant co…