*** 105th Peripatetic Seminar on Sheaves and Logic *** University of Palermo, Italy *** May 18th-19th, 2019 + satellite event May 17th, 2019 Dear colleagues and friends, We are pleased to announce that the 105th PSSL will be held at the University of Palermo, Italy, on the weekend of May 18th-19th, 2019. A satellite event on "Categorical methods in algebra" will be held on Friday May 17th, 2019. We are making this preliminary announcement well in advance, as we hope that many of you will be able to join us and contribute talks for this event. If you have any questions, please feel free to contact us. A web site with practical information will be made available shortly. We hope to see you in Palermo. With best regards, Andrea Montoli Giuseppe Metere Tim Van der Linden (organizers) -- Giuseppe Metere, PhD. Ricercatore di Algebra Dipartimento di Matematica e Informatica Universit?? degli Studi di Palermo [For admin and other information see: http://www.mta.ca/~cat-dist/ ]