*** 105th Peripatetic Seminar on Sheaves and Logic *** University of Palermo, Italy *** May 17th-19th, 2019 *** Third announcement *** Dear colleagues and friends, As you probably already know, the 105th PSSL, will be held at the University of Palermo, Italy, on the weekend of May 17th-19th, 2019. Of course, there is no conference fee. However for practical reasons, we kindly ask to anyone who has the intention to offer a talk, to please register and let us know within the 16th of April. Updated information to be found at the conference website. In particular, the program of the satellite event on *Categorical methods in algebra* (Friday May 17th) is now available! https://sites.google.com/view/pssl-105/ To register, please fill the registration form available on the website. For any question, please feel free to contact us at: pssl105.palermo@gmail.com We hope to see you in Palermo. With best regards, Giuseppe Metere Andrea Montoli 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/ ]