Abstract of a talk at the 12th International Conference “Logic Today: Developments and Perspectives”
papers presented at the conference “Logica 2002″ (June 18-21, 2002, Castle Zahradky, Czech Republic) and published in: T. Childers and O. Majer (eds.), Logica’2002, Prague 2003
The purpose of this paper is twofold: (1) to clarify Ludwig Wittgenstein’s thesis that colours possess logical structures, focusing on his ‘puzzle proposition’ that “there can be a bluish green but not a reddish green”, (2) to compare model-theoretical and game-theoretical approaches to the colour exclusion problem. What is gained, then, is a new game-theoretical framework for the logic of ‘forbidden’ (e.g., reddish green and bluish yellow) colours. My larger aim is to discuss phenomenological principles of the demarcation of the bounds of logic as formal ontology of abstract objects.
This volume contains the abstracts of the talks given at the 2015 European Summer Meeting of the Association for Symbolic Logic—Logic Colloquium ’15—taking place on August 3 - 8, 2015, in Helsinki, Finland. The Colloquium is co-located with the 15th International Congress of Logic, Methodology and Philosophy of Science, CLMPS, and the SLS Summer School in Logic. As usual, the talks at the Logic Colloquium consist of invited plenary lectures, invited talks in the various special sessions, tutorials, and, last but not least, contributed papers. Abstracts of all of these presentations are given here. The book of abstracts is an important part of the Logic Colloquium, since it not only gives the authors the opportunity to present their topic and main results, but also helps the Colloquium participants choose which of the many parallel sessions to attend at any given time. I would like to thank my colleagues in the Program Committee for a very constructive and pleasant period of collaborative effort, which has resulted in, we think, an excellent program of invited speakers, representing current frontline research in the main areas of logic. We are also particularly happy that there are so many contributed papers at this year’s Logic Colloquium. Finally, I want to thank all the members of the Organizing Committee, and in particular its chair Jouko Väänänen, for their expert and smooth organization of this important event.