| Institution: | Universitat de Barcelona, Departament de Lògica, Història i Filosofia de la Ciència, Montalegre 6-8, 08001 Barcelona, Catalonia, Spain; Department of Mathematics, University of California, Los Angeles, CA 90095-1555, United States Department of Mathematics, University of Athens, Panepistimioupolis, Athens, Greece; Departamento de Matemáticas, Universidad Autónoma de Madrid, 28049 Madrid, Spain; Department of Mathematical Logic, Faculty of Mathematics and Computer Science, Sofia University, Blvd. James Bourchier 5, 1164, Sofia, Bulgaria |
