Product Zero Derivations on Strictly Upper Triangular Matrix Lie Algebras

Abstract:

      Let $\mathbb{F}$ be a field, $n\geq 3$, ${\bf N}(n,\mathbb{F})$ the strictly upper triangular matrix Lie algebra consisting of the $n\times n$ strictly upper triangular matrices and with the bracket operation $[x,y]=xy-yx$. A linear map $\varphi$ on ${\bf N}(n, \mathbb{F})$ is said to be a product zero derivation if $[\varphi(x), y]+[x, \varphi(y)]=0$ whenever $[x,y]=0, x,y\in {\bf N}(n,\mathbb{F})$. In this paper, we prove that a linear map on ${\bf N}(n,\mathbb{F})$ is a product zero derivation if and only if $\varphi$ is a sum of an inner derivation, a diagonal derivation, an extremal product zero derivation, a central product zero derivation and a scalar multiplication map on ${\bf N}(n,\mathbb{F})$.