[DL] CfP – SQUARE 9 (Montréal, June 22–26, 2026)

[Jean-Yves Beziau]

We are pleased to announce SQUARE 9  to be held at Université du Québec à
Montréal (UQAM), Montréal, Canada, June 22–26, 2026.
This is the 9th edition of the World Congress on the Square of Opposition
after very successful previous editions in Montreux, Switzerland 2007;
Corte, Corsica 2010; Beirut, Lebanon 2012; Vatican, 2014; Easter Island,
2016; Crete, 2018; Leuven, Belgium 2022; San Jose, Costa Rica, 2024.

SQUARE is a unique interdisciplinary event bringing together logicians,
philosophers, mathematicians, semioticians, computer scientists, artists,
to explore the many facets of the Square of Opposition and its modern
developments.

Topics include (but are not limited to):

   - Classical and non-classical squares
   - Logical geometry (hexagons, cubes, beyond)
   - Philosophical and historical perspectives
   - Applications in cognition, language, and AI
   - Interdisciplinary and creative approaches

Submission deadline: April 17, 2026
Format: One-page abstract

More information and submission details:
https://sites.google.com/view/square9-montreal-2026/

This time of year is one of the very best moments to be in Montréal.
(A) On Wednesday, June 24, the city celebrates the Fête de la
Saint-Jean-Baptiste, the national holiday of Québec. This public holiday
will offer a pleasant break in the middle of our event, which begins on
Monday, June 22.
(B) Immediately afterwards, from June 25 to July 4, Montréal hosts its
world-famous International Jazz Festival, one of the largest and most
vibrant music festivals in the world.
It is worth noting that the first edition of SQUARE took place in Montreux
in 2007, where we organized a jazz performance inspired by the Square of
Opposition:
https://www.square-of-opposition.org/music.html
Excerpts from this performance can be seen and heard in the DVD included
with the proceedings volume:
The Square of Opposition: A General Framework for Cognition
https://www.amazon.com/Square-Opposition-General-Framework-Cognition/dp/3034305370

For more information about (A) and (B), please visit:
https://sites.google.com/view/square9-montreal-2026/montr%C3%A9al

Join us in the vibrant city of Montréal for a stimulating international
meeting at the crossroads of logic, philosophy, mathematics and beyond!

The Organizers
Jean-Yves Beziau, Federal University of Rio de Janeiro (UFRJ), Brazil
Serge Robert, University du Québec à Montréal (UQÀM), Canada
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