We prove that Schütz’s ASEP Markov duality functional is also a Markov duality functional for the stochastic six vertex model. We introduce a new method that uses induction on the number of particles to prove the Markov duality.
"Markov duality for stochastic six vertex model." Electron. Commun. Probab. 24 1 - 17, 2019. https://doi.org/10.1214/19-ECP271