The present volume of Commentationes Mathematicae is dedicated to its Editor, Professor Wladyslaw Orlicz, on the occasion of his 75-th birthday.
Professor Wladyslaw Orlicz, an outstanding mathematician, was as a member of the famous Lwow School among the founders of modern Functional Analysis. The articles collected in this volume, many of them by Professor Orlicz's former students, were inspired by the ideas raised in the Work of Professor Orlicz. It is, we believe, the best symbol of respect that his friends world wide hold for Professor Orlicz.