Combinatorics of essential sets for positroids
- Francesca Zaffalon (KU Leuven)
Positroids are a class of nice realisable matroids, in bijection with many different combinatorial objects. In this talk I will introduce a new characterisation of positroids in terms of essential sets, which allow for a more intuitive understanding of their structure. I will show how one can use essential sets to study positroids and their cells inside the non-negative Grassmannian.