2 problems

Let $K$ be a field of characteristic $0$, and let $M_d(K)$ denote the algebra of $d\times d$ matrices. A central polynomial for $M_d(K)$ is a polynomial that takes central values o…

Let $A$ be a PI algebra, and let $\delta_n(A)$ denote the $n$th codimension sequence associated with its central polynomials. For ordinary codimensions, Giambruno and Zaicev proved…