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math.AG2026
Algebraic Geometry of Electroid Varieties
Dawei Shen, Mia Smith, David E Speyer
Recent work of Lam, Bychkov-Gorbounov-Kazakov-Talalaev, and Chepuri-George-Speyer gave a stratification of the totally nonnegative Lagrangian Grassmannian into electroid cells para…
math.AG2024
Richardson varieties, projected Richardson varieties and positroid varieties
David E Speyer
This is a survey article on Richardson varieties and their combinatorics. A Richardson variety is the intersection, inside the flag manifold GL_n/B_+, of a Schubert cell (B_- u B_+…