2010/09/01 by Terry A. Loring · 1 citation
paper · doi:10.7146/math.scand.a-15142
crossref issued 2010/09/01 · crossref published 2010/09/01 · crossref published-online 2010/09/01 · crossref created 2016/09/13 · crossref deposited 2026/07/10 · crossref indexed 2026/07/30
We investigate relations on elements in C*-algebras, including *-polynomial relations, order relations and all relations that correspond to universal C*-algebras. We call these C*-relations and define them axiomatically. Within these are the compact C*-relations, which are those that determine universal C*-algebras, and we introduce the more flexible concept of a closed C*-relation. In the case of a finite set of generators, we show that closed C*-relations correspond to the zero-sets of elements in a free σ-C*-algebra. This provides a solid link between two of the previous theories on relations in C*-algebras. Applications to lifting problems are briefly considered in the last section.