PAPER / ARXIV:2609.07382
Shuo Chen , Adrien Segovia
RESUMO
We prove that join-semidistributive shellable lattices are join-extremal. In particular, every semidistributive shellable lattice is extremal. Together with known results, this gives the equivalence between extremality, left modularity, EL-shellability and shellability for semidistributive lattices. This answers open questions of Mühle and Segovia.
NO MESMO MAPA