On the continuity of certain intertwining operators, centralizers, and positive linear functionals
On the continuity of certain intertwining operators, centralizers, and positive linear functionals
This theorem is an immediate consequence of a lemma found independently by Varopoulos [9] and Johnson [5] which generalizes Cohen's factorization theorem [1]. This lemma was used by Varopoulos to show that if A has a continuous involution, then every positive linear functional on A is continuous. Johnson used the …