2 citations · 2 across the 2 of their papers we have counts for
4 papers
Closure relations for totally nonnegative cells in G/P
Konstanze Rietsch
The totally nonnegative part of a partial flag variety G/P is known to have a decomposition into semi-algebraic cells. We show that the closure of a cell is again a union of cells…
An introduction to perverse sheaves
Konstanze Rietsch
These notes aim to give a first introduction to intersection cohomology and perverse sheaves with applications to representation theory or quantum groups in mind.
Totally positive Toeplitz matrices and quantum cohomology of partial flag varieties
Konstanze Rietsch
We show that the set of totally positive unipotent lower-triangular Toeplitz matrices in form a real semi-algebraic cell of dimension . Furthermore we prove a natural c…
Quantum Cohomology of Grassmannians and Total Positivity
Konstanze Rietsch
We give a proof of a result of D. Peterson's identifying the quantum cohomology ring of a Grassmannian with the reduced coordinate ring of a certain subvariety of . The total…