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Leonardi.DB
a logical geometry project

On the Historical Transformations of the Square of Opposition as Semiotic Object (2020), p. 12
by Vandoulakis, Ioannis M.; Denisova, Tatiana Yu.

Copyright according to our policy

Caption

Boethius' diagrams of the Square of Opposition. Source: [40]

Logic

Aristotelian family
Classical Sigma-2
Boolean complexity
3
Number of labels per vertex (at most)
0
Uniqueness of the vertices up to logical equivalence
Yes
Errors in the diagram
No

Geometry

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

Vertex description

Conceptual info
Yes
Mnemonic support (AEIO, purpurea ...)
No
Form
none
Label type
none

Edge description

Style

Diagram is colored
No
Diagram is embellished
No
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