The Hexagon of Opposition
Volume 6, Issue 1-2, June 2012
Alessio Moretti, Why the Logical Hexagon?
Peter Simons, Approaching the Alethic Modal Hexagon of Opposition
Didier Dubois and Henri Prade, From Blanché’s Hexagonal Organization of Concepts to Formal Concept Analysis and Possibility Theory
Dany Jaspers, Logic and Colour
The hexagon of opposition is an extension of the square of opposition proposed by Robert Blanché in the 1950s.
Hexagons, like squares, have many versions: quantification, alethic modalities, deontic modalities, negations ... It is a universal tool that helps to understand many concepts through a structure of opposition.
This issue is connected with the second world congress on the square of opposition which was organized in Corsica, June 17-20, 2010