2 problems

Let $S$ be a matrix in a Seifert form stratum of $T(n,\mathbb R)$ that is not met by $\bigcup_{k=1,2}T_{{\rm HOR}k}(n,\mathbb R)$. Let $\operatorname{Sp}(S)$ and…

Let $T(n,\mathbb R)$ be the space of upper triangular matrices under consideration. A Seifert form stratum is a union of components of a fiber of the map to isomorphism classes of…