Symmetric Submodular Functions, Uncrossable Functions, and Structural Submodularity

Miles Simmons, Ishan Bansal, Joe Cheriyan

Diestel, et al. (see Order 35 (2017), JCT-A 167 (2019), arXiv:1805.01439) introduced the notion of abstract separation systems that satisfy a submodularity property, and they call…