In non-commutative Gelfand theory, families of Banach algebra homomorphisms, and particularly families of matrix representations, play an important role. Depending on the properties imposed on them, they are called sufficient, weakly sufficient, partially weakly sufficient, radical-separating or separating. I n this paper these families are compared with one another. Conditions are given under which the defining properties amount to the same. Where applicable, examples are presented to show that they are genuinely different.

Banach algebra homomorphism, Matrix representation, Partially weakly sufficient family, Polynomial identity algebra, Radicalseparating family, Separating family, Spectral regularity, Sufficient family, Weakly sufficient family
Department of Econometrics

Bart, H, Ehrhardt, T, & Silbermann, B. (2012). Families of homomorphisms in non-commutative gelfand theory: Comparisons and examples. Retrieved from