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This book is dedicated to the memory of Hughes Leblanc whose work was influential in many fields of philosophical logic, including especially truth-value (substitutional) semantics, probabilistic interpretations for classical and intuitionistic logic and natural deduction. In 1970, Hughes joined with 23 other philosophers and logicians attending a conference in Montréal to found the Society for Exact Philosophy. The papers collected in this volume derive from the program of the annual meeting of the Society for Exact Philosophy held at the Université de Montréal in 2001. All of the papers are in the spirit of Hughes' work: to explore and try to solve philosophical problems in a sound and systematic way, with the help of formal logico-mathematical tools.

This collection of essays in honor of Prof. Stig Andur Pedersen's 60th Birthdayspans over a broad scope of topics, ranging from mathematical modelling overrealism in philosophy of science to an analysis of apology after medicalmistakes. The unusually broad range is a fair but still inadequate reflectionof the work of Stig Andur Pedersen, a philosopher and scientist whose range ofinterests, abilities and production is itself unusually broad.

Ilkka Niiniluoto, a distinguished philosopher of science, has been a tirelesspokesman for scientific realism and reason more generally. Trained in the tradition of the Finnish school of inductive logic he has refined the notion of truthlikeness (verisimilitude) to make the realist idea scientific progress mathematically exact. Niiniluotös main technical works are included in his books Is Science Progressive? (1984) and Truthlikeness (1987), but his most recent general defense of scientific realism culminated in his Critical Scientific Realism (1999). Niiniluoto is, since 1981, Professor of Theoretical Philosophy at the University of Helsinki, and since 2003 the Rector of the University. He has for a long time been one of the most prominent public intellectuals in Finland.This Festschrift brings about a selection of philosophical essays on Niiniluotös philosophy by prominent member of the international community. The contributions are grouped around three themes. The first ones deal with philosophy of logic, the philosophy of language, and the philosophy of mathematics, and the second group consists of papers on induction, truthlikeness, and scientific progress. The third part collects essays on the history of logical empiricism, the ontology of social groups, and the dispute between theism and atheism. This book is a tribute to Ilkka Niiniluoto on his 60th birthday, and it also contains Niiniluoto's replies to comments, queries and criticisms.

Non-classical views about important issues in logic and its philosophy are a distinctive trait of Shahid Rahman's work. This volume has been designed, on the occasion of his 50th birthday, as a gathering place for unconventional approaches, original ideas and attempts to question well-established standards. Some of the world top philosophers and logicians contributed to a brilliant collection of papers, some of which doubtlessly leave their mark on the work to come in logic and in philosophy of formal sciences.Contributors are: Philippe Balbiani, Diderik Batens, Johan van Benthem, Giacomo Bonanno, Walter A. Carnielli, Newton C. A. Da Costa, Michel Crubellier, Francisco A. Doria, Dov M. Gabbay, Olivier Gasquet, Gerhard Heinzmann, Andreas Herzig, Jaakko Hintikka, Justine Jacot, Reinhard Kahle, Erik C. W. Krabbe, Décio Krause, Franck Lihoreau, Kuno Lorenz, Ilkka Niiniluoto, Graham Priest, Stephen Read, Manuel Rebuschi, Greg Restall, Gabriel Sandu, Gerhard Schurz, François Schwarzentruber, Yaroslav Shramko, Göran Sundholm, John Symons, Christian Thiel, Nicolas Troquard, Tero Tulenheimo, Jean Paul Van Bendegem, Daniel Vanderveken, Yde Venema, Heinrich Wansing, Jan Wolenski and John Woods.

The Editors' vision for this volume is that it should be a selection of essays, contributed by the academics who have worked, studied, collaborated and disagreed with Göran Sundholm; engaging in debated issues and exploring untouched areas maybe only suggested or hinted at in Sundholm's own work. "Acts of Knowledge" characterizes the papers contained in this volume as bringing something scientifically valuable in their respective fields: all the papers present cutting-edge research in their own style, contributing to very lively debates occurring in the literature in logic, philosophical logic and history of logic. But it also hints at Göran's constructivist background, which has been an influence or a challenge for many of the contributors. "History, Philosophy and Logic" refers directly to Göran's broad interests into the various aspects of the Philosophy of Logic, Mathematics, and Language, their origins and development, especially with the focus on the Modern History of Logic and the philosophical implications thereof. The readers will find scattered all along this volume pieces of -- and reflections on -- all these themes.