Bourbaki

Exercise 20, § 2

Tag 0277, permanent. Cite it as [Bourbaki, Tag 0277].

Spectral Theories, I, p. 159

In the algebra A of Example 9 of I, p. 20, the identical function zz is neither invertible nor a topological zero divisor.

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Machine translation of the English, by gpt-5-mini. Not checked by a person. That model is a cut down version of the one the rest of this language was written by.