Using five-vertex model wavefunctions, the author reproves the Guo-Sun identity and proves a new identity and duality for rectangular factorial Grothendieck polynomials.
Buch, A Littlewood-Richardson rule for the K-theory of Grassmannians, Acta
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Integrability approach to Feher-Nemethi-Rimanyi-Guo-Sun type identities for factorial Grothendieck polynomials
Using five-vertex model wavefunctions, the author reproves the Guo-Sun identity and proves a new identity and duality for rectangular factorial Grothendieck polynomials.