FIFTH ANNOUNCEMENT INTERNATIONAL CATEGORY THEORY CONFERENCE (CT04) July 18-24, 2004 University of British Columbia Vancouver, Canada This conference will be held on the University of British Columbia campus. It will begin with a reception at 6pm on Sunday July 18, 2004, and will end at 1pm on Saturday July 24, 2004. All those interested in category theory and its applications are welcome. Information about deadlines for abstracts, registration and accommodation may be found at the end of this letter as well as on the conference website http://www.pims.math.ca/science/2004/CT04 If you think that you will attend or may attend, and have not previously made any indication of this to the organizer, then please send a note to johnm@math.ubc.ca with the words "will attend" or "may attend", as appropriate. The issue involved here is whether the PIMS new lecture room can be used for the talks or whether something bigger will have to be booked. Some important deadlines are as follows: Abstracts - May 31, 2004. If you would like to give a talk at the conference, then please send in a short abstract of length about half a page but not longer than one page. Please submit this on the form from the conference website http://www.pims.math.ca/science/2004/CT04/abstracts.html Due to the potentially large number of submissions it may not be possible to reserve a place on the program for all those who submit an abstract. Registration Deposit or Early Registration payment - May 31, 2004 Please see the website http://www.pims.math.ca/science/2004/CT04/registration.html It is possible to make payment by bank transfer in addition to the option of payment by cheque. Details of the address and account number can be supplied on request. Accommodation - June 18, 2004. After this date the block of rooms reserved for CT04 will be released to the general public, although reservations can still be made if space is available. Early booking is recommended, especially for those with accompanying persons. Extra spaces for the excursion or banquet for accompanying persons - June 30, 2004. The opening reception, excursion and banquet for delegates is included in the conference fee as well as morning and afternoon coffee breaks, lecture room rentals and other miscellaneous conference expenses. Accommodation and meals are not included in the fee. CT04 Advisory Committee: Jiri Adamek, University of Braunschweig, Germany Michael Barr, McGill University, Canada Eduardo Dubuc, University of Buenos Aires, Argentina Marco Grandis, University of Genoa, Italy George Janelidze, Capetown, South Africa Michael Johnson, Macquarie University, Australia P. T. Johnstone, Cambridge University, UK F. W. Lawvere, University at Buffalo, USA J. MacDonald, University of British Columbia, Canada S. Niefield, Union College, USA T. Porter, University of Wales, UK Jiri Rosicky, Masaryk University, Czech Republic Phil Scott, University of Ottawa, Canada Robert Seely, McGill University, Canada Art Stone, Vancouver, Canada Ross Street, Macquarie University, Australia Enrico Vitale, Louvain-la-Neuve, Belgium Walter Tholen, York University, Canada R. J. Wood, Dalhousie University, Canada This conference is being organized with help from the Pacific Institute of Mathematics(PIMS) and the UBC Conference Centre. John MacDonald, Vancouver