Published online by Cambridge University Press: 01 February 1998
The following result is well known and easy to prove (see [14, Theorem 2.2.6]).
Theorem 0. If A is a primitive associative Banach algebra, then there exists a Banach space X such that A can be seen as a subalgebra of the Banach algebra BL(X) of all bounded linear operators on X in such a way that A acts irreducibly on X and the inclusion A[rarrhk ]BL(X) is continuous.
In fact, if X is any vector space on which the primitive Banach algebra A acts faithfully and irreducibly, then X can be converted in a Banach space in such a way that the requirements in Theorem 0 are satisfied and even the inclusion A[rarrhk ]BL(X) is contractive.
Roughly speaking, the aim of this paper is to prove the appropriate Jordan variant of Theorem 0.