Finitely presented algebras and groups defined by permutation relations

Cedo, F.; Jespers, E.; Okninksi, J.

Finitely presented algebras and groups defined by permutation relations

Authors

Cedo, F.

Jespers, E.

Okninksi, J.

Description

The class of finitely presented algebras over a field $K$ with a set of generators $a_{1},..., a_{n}$ and defined by homogeneous relations of the form $a_{1}a_{2}... a_{n} =a_{σ(a)} a_{σ(2)} ... a_{σ(n)}$, where $σ$ runs through a subset $H$ of the symmetric group $\Sym_{n}$ of degree $n$, is introduced. The emphasis is on the case of a cyclic subgroup $H$ of $\Sym_{n}$ of order $n$. A normal form of elements of the algebra is obtained. It is shown that the underlying monoid, defined by the same (monoid) presentation, has a group of fractions and this group is described. Properties of the algebra are derived. In particular, it follows that the algebra is a semiprimitive domain. Problems concerning the groups and algebras defined by arbitrary subgroups $H$ of $\Sym_{n}$ are proposed.
10 pages