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

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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