We show that the identity is the sum of two commutators in the algebra of all operators affiliated with a von Neumann algebra of type II${}_1$, settling a question, in the negative, that had puzzled a number of us.

中文翻译：

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关于无界算子代数中的换向器的注记

我们证明了恒等式是与II型冯·诺依曼代数有联系的所有算子的代数中两个交换子的总和${}_{\mathrm{1个}}$否定了一个使我们感到困惑的问题。