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**On the Krull property in topological algebras.**
*(English)*
Zbl 1180.46035

The paper deals with Krull and \(Q'\)-algebras. The author gives sufficient conditions under which a topological algebra is an annihilator algebra if and only if it is a Krull algebra. It is also shown that, in the case of a semisimple regular annihilator topological algebra \(E\), \(E\) is a Krull algebra if and only if every proper closed left (or right) ideal is contained in a proper left (respectively, right) annihilator ideal. Let \(E\) be a topological algebra and \(I\) a two-sided ideal. Some properties, like being a Krull algebra or a \(Q'\)-algebra, of the quotient algebra \(E/I\) are induced from similar properties of \(E\). In the last section, some properties of orthocompleted algebras and subalgebras of Krull algebras are stated. The question when the Krull property of a tensor product algebra is inherited by its tensor factors is studied. Four open questions are formulated.

Reviewer: Mart Abel (Tartu)

### MSC:

46H05 | General theory of topological algebras |

46H10 | Ideals and subalgebras |

46K05 | General theory of topological algebras with involution |

46M05 | Tensor products in functional analysis |

46H20 | Structure, classification of topological algebras |