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Leonardi.DB
a logical geometry project

The Square of Opposition: Past, Present, and Future (2022), p. 4
by Beziau, Jean-Yves; Vandoulakis, Ioannis M.

Caption

Brazilian version of Blanché’s book. (Cover by Sergio Kon of the Book by Robert Blanché Estruturas intelectuais: ensaio sobre a organização sistemática dos conceitos. Reproduction courtesy of EDITORA PERSPECTIVA, https:// editoraperspectiva.com.br/ produtos/estruturasintelectuais/)

Logic

Number of labels per vertex (at most)
1
Errors in the diagram
No

Geometry

Shape
Hexagon (regular)
Colinearity range
0
Coplanarity range
0
Cospatiality range
0
Representation of contradiction
By central symmetry

Vertex description

Conceptual info
No
Mnemonic support (AEIO, purpurea ...)
No

Edge description

Contains definitions of relations
No
Form
dotted lines
,
solid lines
Has arrowheads
No
Overlap
No
Curved
No
Hooked
No
As wide as vertices
No
Contains text
No
Label type
none

Style

Diagram is colored
Yes
Diagram is embellished
Yes
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