and present either original research papers or high quality survey articles. The
chapters are almost equally divided between the two themes.
The Editors are grateful to the authors and co-authors for the time and efforts
they put in writing, revising, and formatting their work according to the high
standards set by the American Mathematical Society. We are also indebted to the
referees for their meticulous reports. Last but not least, we would like to thank the
Editorial Board of the Contemporary Mathematics Series for publishing this volume
and Christine M. Thivierge, Editorial Assistant, American Mathematical Society,
for her help and guidance throughout the editorial and production processes.
Joseph M. Rosenblatt, Alexander M. Stokolos and Ahmed L Zayed