Conference and papers for Charles Ehresmann's centenary I recall that we organize an International Conference "Charles Ehresmann 100 ans" to commemorate the 100th anniversary of Charles' birth. It will take place at the Universite de Picardie Jules Verne in Amiens, from October 7 to 9, 2005. The first day will consist in general lectures on the life and works of Charles, and their prolongations. The 2 other days, there will be 2 parallel sessions: Category theory, Topology and Geometry, including the 82nd session of the PSSL "Peripatetic Seminar on Sheaves and Logic" and a session of the SIC (Seminaire Itinerant de Categories), Multidisciplinary applications with a Symposium ECHO V. The complete program can be found on the Internet site dedicated to Charles: http://perso.wanadoo.fr/vbm-ehr/ChEh which also contains some photos and documents on Charles, and papers dedicated to him. The abstracts of the lectures presented to the Conference will appear in Volume XLVI-3 of the "Cahiers de Topologie et Geometrie Differentielle Categoriques". The participation to the Conference is free. If you want to participate, please contact me by sending your name and address to ehres@u-picardie.fr Same address if you want to send a paper to be posted on the site. Sincerely Andree C. Ehresmann