Bumpless pipe dreams meet Puzzles

Neil J. Y. Fan, Peter L. Guo, Rui Xiong

Knutson and Zinn-Justin recently found a puzzle rule for the expansion of the product ${\mathfrak{G}}_u(x,t)\cdot {\mathfrak{G}}_v(x,t)$ of two double Grothendieck polynomials inde…