The subalgebra of graded central polynomials of an associative algebra

Galina Deryabina, Alexei Krasilnikov

Let $F$ be a field and let $F⟨X⟩$ be the free unital associative $F$-algebra on the free generating set $X=\{x_1,x_2,\dots \}$. A subalgebra (a vector subspace)…