CAUTION: The Sender of this email is not from within Dalhousie. The editors of TAC (Theory and Applications of Categories) are pleased to announce a new series of the journal entitled "TAC Expositions". This is a separate series from the standard journal, with a specific focus on expository articles in the theory and applications of categories. The editorial policy of the new series states: "Expositions in Theory and Applications of Categories (`TAC Expositions') is a special series specifically designed for publication of well-written and novel expository articles on topics of current research interest in the theory and/or applications of categories. While a TAC Exposition article need not include new results, it must be novel in either its arrangement or viewpoint, providing a new perspective or context for known results. Authors considering submitting an expository paper are advised to consult an editor on its suitability for TAC Expositions." For more information, see http://www.tac.mta.ca/tac/expositions/index.html. We look forward to receiving your contributions for this new series! All the best, Geoff Cruttwell TAC Managing Editor [For admin and other information see: http://www.mta.ca/~cat-dist/ ]