The New Rising of the Square of Opposition (2012), p. 15
by Beziau, Jean-Yves

Copyright according to our policy

Caption

Truth-valued square of contrariety

Logic

Aristotelian family

Contrariety 4-clique

Boolean complexity

4

Number of labels per vertex (at most)

1

Uniqueness of the vertices up to logical equivalence

Yes

Errors in the diagram

No

Geometry

Shape

Rectangle (irregular)

Colinearity range

0

Coplanarity range

0

Cospatiality range

0

Representation of contradiction

N.A.

Vertex description

Conceptual info

No

Mnemonic support (AEIO, purpurea ...)

No

Form

none

Label type

linguistic

Language

English

Lexical field

truth values

Contains partial sentences or single words

Yes

Contains abbreviations

No

Edge description

Style

Diagram is colored

Yes

Diagram is embellished

No

Additional notes

The negation closure of this diagram is a Moretti-Pellissier sigma-4.