JPAA issue in honor of S.Mac Lane

PROCEDINGS OF THE CATEGORY THEORY CONFERENCE IN COIMBRA (JULY 1999) A special issue of the Journal of Pure and Applied Algebra, dedicated to the ninetieth birthday of Saunders Mac Lane, is planned to contain the proceedings of the Coimbra meeting. Due to space limitations, only contributions closely related to lectures presented at the conference will be accepted. The submission deadline is November 30, 1999, and more detailed instructions about submissions will be announced during the conference. J. Adamek, P. Johnstone, and M. Sobral editors of the special issue