Mirabolic affine Grassmannian and character sheaves by Ginzburg, Victor, Travkin, Roman, Finkelberg, Michael

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Weak separation and plabic graphs by Oh, S., Speyer, D. E., Postnikov, Alexander

“…Postnikov studied total positivity on the Grassmannian. He described a stratification of the totally non-negative Grassmannian into positroid strata, and constructed theirparameterization using plabic graphs. …”
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Schur Times Schubert via the Fomin-Kirillov Algebra by Meszaros, Karola, Panova, Greta, Postnikov, Alexander

“…We study multiplication of any Schubert polynomial S[subscript w] by a Schur polynomial sλ (the Schubert polynomial of a Grassmannian permutation) and the expansion of this product in the ring of Schubert polynomials. …”
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On-shell structures of MHV amplitudes beyond the planar limit by Arkani-Hamed, Nima, Bourjaily, Jacob L., Cachazo, Freddy, Postnikov, Alexander, Trnka, Jaroslav

“…This is understood in terms of an extended notion of positivity in G(2, n), the Grassmannian of 2-planes in n dimensions: a single on-shell diagram can be associated with many different “positive” regions, of which the familiar G [subscript +](2, n) associated with planar diagrams is just one example. …”
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