The Power of the Hexagon (2012), p. 31
by Beziau, Jean-Yves

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Caption

A red and black hexagon 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

Hexagon (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

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

;

non-contingent formulas

Additional notes

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

This diagram contains a tautology and a contradiction, and is thus not restricted to contingent propositions.