One of the most fruitful activities that takes place at a conference is the interchange of problems. Often, in later years the success of a conference may be judged by the number of problems raised there which are eventually solved. The papers in the remainder of this volume contain several problems, but here are some more that did not fit naturally into any of those papers. I hope to see solutions of at least some of these problems in the pages of Positivity in years to come.

中文翻译：

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公开问题

会议上进行的最富有成果的活动之一是问题的交换。通常，在以后的几年中，会议的成功可能取决于那里最终解决的问题数量。本卷其余部分中的论文包含几个问题，但这里有一些其他问题自然不适合这些论文。我希望在未来几年中在“积极性”页面中看到至少其中一些问题的解决方案。