RENDICONTI DELL'ISTITUTO DI MATEMATICA DELL'UNIVERSITÀ DI TRIESTE
Abstract
This paper collects some problems that I have encountered
during the years, have puzzled me and which, to the best of my knowl-
edge, are still open. Most of them are well{known and have been first
stated by other authors. In this sad season of pandemic, I modestly
try to contribute to scientific interaction at a distance. Therefore all
comments and exchange of information are most welcome.
