This book contains the proceedings of the International Workshop on Interpolation Spaces and Related Topics, held at Technion in Haifa, Israel, in the summer of 1990. Interpolation spaces have their roots in the classical interpolation theorems of Marcikiewicz and Riesz-Thorin. In the last three decades, the study of these spaces has developed into an extensive theory with applications in several fields, including harmonic analysis, partial differential equations, and geometry of Banach spaces. Substantial contributions have come from both sides of the former “Iron Curtain”, and the Haifa Workshop was the first time that sizable contingents of experts from East and West could meet and interact.

The twenty-one research papers in this volume reflect recent developments at the frontier of research in several directions in interpolation theory. In addition, the volume provides a concise and convenient summary of interesting but hitherto less well-known work in interpolation from the Russian schools of Yaroslavl and Kazan. One highlight is an extensive list of unsolved problems in interpolation theory, including contributions from a number of experts who were unable to attend the workshop.