3 problems

Let $H$ be an internal symmetry group, let $\mathbb{Z}^d$ act by discrete translations, and let $\mathcal{S}^{d}(H,\mathbb{Z}^d)$ denote the set of $(d+1)$-dimensional gapped short…

Two-direction translation-invariant SPT classification conjecture. Assuming the stable SPT classes carry the conjectured abelian-group structure, this sequence induces a sequence o…

Consider a Haldane-model calculation with periodic boundary conditions, where $P$ is the Fermi projection and $X$ is the lattice position operator in the $x$ direction. The operato…