2 problems

Let $(A_{s s'})$ be a Cartan matrix of a finite-dimensional semisimple Lie algebra $\cal G$. Under the assumptions $\eps_s>0$ and $K_s>0$, consider the differential equations with…

Polynomial-space classification conjecture. If $T_k(x,y)$ preserves a finite-dimensional space of all polynomials other than ${\cal P}_{n}^{I}$, ${\cal P}_{n,m}^{II}$, and…