Bounds for entries of $\gamma$-vectors of flag homology spheres

Jean-Philippe Labbé, Eran Nevo

We present some enumerative and structural results for flag homology spheres. For a flag homology sphere $\Delta$, we show that its $\gamma$-vector ${\gamma }^{\Delta }=(1,{\gamma }_1,{\gamma }_2,\dots )$ satisfies: \begin…