On seven families of algebras
W. B. Turner

Abstract:

"This paper encircles the Schiver doubles,
introduced in the article ``Rock blocks'' \cite{Rock}.
The doubles are a gang of symmetric algebras ${\cal D}_\Gamma(n)$,
one for each graph $\Gamma$, and natural number $n$.

We discuss algebraic relations between the Schiver doubles,
and six other families
of algebras... blocks of symmetric groups,
Zigzag algebras, Preprojective algebras,
Rhombal algebras, symplectic reflection algebras,
and blocks of category ${\cal O}$."