3 problems

Nussbaum's conjecture. The minimal period of $x$ is at most

Let $X$ be a codimension-one variety and let $\mathcal{X}_B=\bigcup_i X_i$ be its stratification with respect to a given polyhedral norm, assuming that this stratification exists.…

Let $\mathsf{A}_n$ and $\mathsf{D}_n$ be the root lattices in their natural embeddings, and consider both the $L^1$ and $L^{\infty}$ polyhedral norms. Write $V_{<}(N_{\mathcal L})$…