A direct proof of well-definedness for the polymatroid Tutte polynomial

Xiaxia Guan, Xian'an Jin

For a polymatroid $P$ over $[n]$, Bernardi, Kálmán and Postnikov [\emph{Adv. Math.} 402 (2022) 108355] introduced the polymatroid Tutte polynomial ${\mathcal{T}}_P$ relying on the…