Universal central extensions of $s{l}_{m|n}$ over $Z/2Z$-graded algebras

Hongjia Chen, Jie Sun

We study central extensions of the Lie superalgebra $s{l}_{m|n}(A)$, where $A$ is a $Z/2Z$-graded superalgebra over a commutative ring $K$. The Steinberg Lie superalgebra $st_{m|n}(A…