Partition C*-algebras

Abstract: We give a definition of partition C*-algebras: To any partition of a finite set, we assign algebraic relations for a matrix of generators of a universal C*-algebra. We then prove how certain relations may be deduced from others and we explain a partition calculus for simplifying such computations. This article is a small note for C*-algebraists having no background in compact quantum groups, although our partition C*-algebras are motivated from those underlying Banica-Speicher quantum groups (also called easy quantum groups). We list many open questions about partition C*-algebras that may be tackled by purely C*-algebraic means, ranging from ideal structures and representations on Hilbert spaces to K-theory and isomorphism questions. In a follow up article, we deal with the quantum algebraic structure associated to partition C*-algebras.