The Power of the Hexagon (2012), p. 30
by Beziau, Jean-Yves

Copyright according to our policy

Caption

A red and black square of opposition

Logic

Aristotelian family

A Single PCD

Boolean complexity

2

Number of labels per vertex (at most)

1

Uniqueness of the vertices up to logical equivalence

No

Errors in the diagram

No

Geometry

Shape

Rectangle (irregular)

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

symbolic

Symbolic field

logic

Contains partial formulas or symbols

No

Logical system

propositional logic

Edge description

Style

Diagram is colored

Yes

Diagram is embellished

No

Tags

Boolean closed

Additional notes

Subalternation is here understood in the weak sense, i.e., as including the possibility of logical equivalence.