翻转经常是不连续的
The flip is often discontinuous
摘要:
设$A$是一个巴拿赫代数. $A \otimes A^\op$上的翻转通过$A \otimes A^\op \ni a \tensor b \mapsto b \tensor a$定义。如果$A$是超素的,则$\El(A)$,即$A$上所有初等算子的代数,可以代数地与$A \otimes A^\op$等同,因此翻转在$\El(\A)$上被很好地定义。我们证明了$\El(A)$上的翻转是不连续的,如果对于自反巴拿赫空间$E$,$A = K(E)$具有逼近性质。
英文摘要:
Let $A$ be a Banach algebra. The flip on $A \otimes A^\op$ is defined through $A \otimes A^\op \ni a \tensor b \mapsto b \tensor a$. If $A$ is ultraprime, $\El(A)$, the algebra of all elementary operators on $A$, can be algebraically identified with $A \otimes A^\op$, so that the flip is well defined on $\El(\A)$. We show that the flip on $\El(A)$ is discontinuous if $A = K(E)$ for a reflexive Banach space $E$ with the approximation property.
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