2 problems

Let $L$ be a non-nilpotent regular Lie algebra with a nondegenerate symmetric invariant bilinear form. An element $x\in L$ is called a commutant element if $x$ belongs to the commu…

Let $m\geq2$. A NIS-Lie superalgebra is a Lie superalgebra equipped with a nondegenerate invariant supersymmetric bilinear form. The notation $\widetilde{\mathfrak{po}}(0|2m)$ deno…