The Hard Lefschetz Theorem for PL spheres
arXiv:1906.00737
Abstract
We provide a simpler proof of the hard Lefschetz Theorem for face rings of PL spheres: While the algebraic theory remains the same, we replace the geometric constructions by Pachner's Theorem. This simplifies the reasoning for an important special case of the main result of the first author in arxiv:1812.10454, and already implies the McMullen g-conjecture for PL spheres, as well as the Grünbaum-Kalai-Sarkaria conjecture.
subsumed into arXiv:1906.05859