Séminaire Lotharingien de Combinatoire, 93B.62 (2025), 12 pp.
Grant Barkley, Jonathan Boretsky, Chris Eur and Jiyang Gao
On Two Notions of Total Positivity for Generalized Partial Flag Varieties of Classical Lie Types
Abstract.
For Grassmannians, Lusztig's notion of total positivity coincides with positivity of the Plücker coordinates. This coincidence underpins the rich interaction between matroid theory, tropical geometry, and the theory of total positivity. Bloch and Karp furthermore characterized the (type A) partial flag varieties for which the two notions of positivity similarly coincide. We characterize the symplectic (type C) and odd-orthogonal (type B) partial flag varieties for which Lusztig's total positivity coincides with Plücker positivity.
Received: November 15, 2024.
Accepted: February 15, 2025.
Final version: April 1, 2025.
The following versions are available: