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Leonardi.DB
a logical geometry project

Disentangling Contradiction from Contrariety via Incompatibility (2016), p. 161
by Beziau, Jean-Yves

Caption

Square of opposition--traffic signs

Logic

Aristotelian family
Classical Sigma-2
Boolean complexity
3
Number of labels per vertex (at most)
1
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
No
Mnemonic support (AEIO, purpurea ...)
No
Form
none
Label type
iconic

Edge description

Style

Diagram is colored
Yes
Diagram is embellished
No
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