The Assimilation of Aristotelian and Arabic Logic up to the Later Thirteenth Century (2008), p. 317
by Lagerlund, Henrik

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Caption

The Hexagon of Opposition

Logic

Aristotelian family

Sherwood-Czeżowski Sigma-3

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

Hexagon (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

linguistic

Language

English

Lexical field

categorical

,

singular propositions

Contains partial sentences or single words

No

Contains abbreviations

No

Edge description

Style

Diagram is colored

No

Diagram is embellished

No