CALL FOR PAPERS Special volume for CT200 The journal "Theory and Applications of Categories" has agreed to publish a special volume dedicated to work presented at the International Conference on Category Theory CT2000, held in Como, in July. CT2000 intended to present work in all areas of category theory and its applications, but particularly in the following areas: * topos theory and synthetic differential geometry, * algebraic topology and homological algebra, * enriched category theory and 2-dimensional universal algebra, * higher dimensional category theory and quantum algebra, * categorical logic, * galois theory and descent, * categories and computer science, * general category theory. We invite each participant who offered a scientific contribution (a talk or a poster) at the conference to submit a complete version of that work. All papers submitted will undergo the usual TAC referee process. Papers will appear as soon as they are accepted. All papers accepted will appear in the same volume of TAC which we hope will be completed before end of 2001. The TAC home page is at the URL http://www.tac.mta.ca/tac/ . The submission deadline for the special issue is November 30, 2000. Please send a compressed_ postscript file to ct2000@disi.unige.it, or 3 paper copies to R.F.C. Walters (CT 2000) Dipartimento di Scienze CC., FF., MM. Universita` degli Studi dell'Insubria 22100 Como Italy We remind possible contributors that the journal TAC can only accept files prepared with TeX or LaTeX following specific directions as indicated at the URL above. Most authors ought to be able to arrange for such a file to be prepared from their paper, but if you have problems, let us know and we shall try to help. We invite interested contributors to inform us of their intention to submit and to check the web page for the conference at http://www.disi.unige.it/conferences/ct2000/ for further future information. The Editors: Aurelio Carboni Giuseppe Rosolini Robert F.C. Walters