This is the homepage of the TACL series. It is currently under construction. In the meantime, you can visit a preliminary version of the TACL 2019 website here:

You can also see the Call for Papers.

If you wish to be notified about the current and future TACL events, you can subscribe by filling in the form:

The link between logic and algebra, which goes back to the pioneering work of George Boole in the early nineteenth century, justifies the modern algebraic point of view on logical formalisms. Since the pioneering work of Marshall Stone on the topological duality of Boolean algebras in the 1930s, topological methods have acquired an increasing importance in the semantic study of logic, whether classical or not. The importance of the triangle formed by algebra, logic, and topology has been established in several logical frameworks: from modal logic to substructural logic, through intuitionist logic and topos theory. The theory of categories, which appeared in the middle of the twentieth century, provides effective tools for understanding this triangle, and for generalizing certain results to broader frameworks, for example when moving from the propositional calculus to the predicate calculus, or from the logic of provability to logic of evidence.

Given the success of these ideas and their applications in computer science, there has been a rapid development in recent decades, mainly driven by computer science communities. Applications range from the semantics of programming languages to complexity theory and system verifications. These recent developments have made it possible to build a new field of research in logic that is difficult to summarize with a single sentence or to characterize with a single paradigm. The researchers adapt and combine results and tools from various branches of mathematics and theoretical computer science, for example: universal algebra, general topology, category theory, order theory, and model theory. This field of research, which has by now acquired a profile of its own, is represented by the conference series TACL: Topology, Algebra and Categories in Logic.

The series was founded in 2003 by Leo Esakia (Tbilisi, Republic of Georgia) and Mai Gehrke (then in Las Cruces, USA) through a NATO project prepared in collaboration with Guram Bezhanishvili, a young postdoc at the time, making the connection between the two groups. The first meeting was held in Tbilisi, under the name International Conference on Algebraic and Topological Methods in Non-Classical Logics. In 2005, a second conference expanded the theme, paying particular attention to multivalued logics and residuated structures. This meeting took place in Barcelona, organized by the research group around Josep Maria Font and Ramon Jansana. In 2007, the third meeting was held in Oxford, organized by Mai Gehrke and Hilary Priestley. There were also satellite workshops organized by Bob Coecke, Alexander Kurz and Michael Zacharyaschev. Although category theory has been a topic of the conferences since the beginning, it was agreed at the Oxford meeting that it should be made clearer by changing the name to Topology, Algebra, and Categories in Logic.

Based on a request from the participants of the series, an associated summer school has been added since 2013.

2017: Prague (20-24 and 26-30 June 2017, 119 speakers, 150 participants), organised by Marta Bílková and Petr Cintula, homepage, CfP.

2015: Ischia (15-19 and 21-26 June 2015, 90 speakers, 170 participants), organised by Antonio Di Nola, Giacomo Lenzi, and Luca Spada, homepage, CfP.

2013: Nashville (24-27 July and 28 July-5 August 2013, 63 speakers, 89 participants), organised by Warren McGovern, Francesco Paoli, and Constantine Tsinakis, homepage, CfP.

2011: Marseille (26-30 July 2011, 82 speakers, 130 participants), organised by Luigi Santocanale, Yves Lafont, and Nicola Olivetti, homepage, CfP.

2009: Amsterdam (7-11 July 2009, 74 speakers, 120 participants), organised by Yde Venema and Alessandra Palmigiano, homepage.

2007: Oxford (5-9 August 2007, 70 speakers, 150 participants), organised by Mai Gehrke and Hilary Priestley, homepage, CfP.

2005: Barcelona (15-18 June 2005, 90 speakers and nearly 200 participants), organised by Josep Maria Font, homepage, abstracts, CfP.

2003: Tbilisi (7-11 July 2003, 27 speakers and about 50 participants), homepage.