The success of the May 1982 Workshop which resulted in
this volume was due in large measure to the active and friendly
participation of all who attended, to the valued assistance of
Rosemary Marciniak and Judy Bittner, and to the financial
assistance granted by SUNY Buffalo. We thank all these, and
especially thank Fatima Lawvere, whose dedicated efforts brought
about the atmosphere which all enjoyed.
For the preparation of this volume, the editors give thanks
to Gail Berti for her excellent typing, and to the National
Science Foundation for financial support.