One-sided Hopf algebras and quantum quasigroups

ABSTRACT

We study the connections between one-sided Hopf algebras and one-sided quantum quasigroups, tracking the four possible invertibility conditions for the left and right composite morphisms that combine comultiplications and multiplications in these structures. The genuinely one-sided structures exhibit precisely two of the invertibilities, while it emerges that imposing one more condition often entails the validity of all four. A main result shows that under appropriate conditions, just one of the invertibility conditions is sufficient for the existence of a one-sided antipode. In the left Hopf algebra which is a variant of the quantum special linear group of two-dimensional matrices, it is shown explicitly that the right composite is not injective, and the left composite is not surjective.

KEYWORDS:

• Hopf algebra
• left Hopf algebra
• left quasigroup
• quantum group
• quantum quasigroup

2010 MATHEMATICS SUBJECT CLASSIFICATION:

• 16T99
• 20N05