3 problems

Coefficient-determinant positivity conjecture. The determinants of the coefficients $A_j$ of an HTM polynomial ${\bf f}_n$ are positive.

For each positive integer $n$, let $N_n(x)$ be the type A minuscule polynomial … A real polynomial is weakly Hurwitz stable if it is non-vanishing or identically zero when…

Euler-zigzag stability threshold conjecture. For any $n\geq 3$, the polynomial