Singular statements (1987), p. 221
by Lilje, Gerald W.

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Caption

Hexagon of Opposition

Legend

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 (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 ...)

Yes

Form

none

Label type

linguistic

,

symbolic

Language

English

Lexical field

categorical

,

singular propositions

Contains partial sentences or single words

No

Contains abbreviations

No

Symbolic field

logic

Contains partial formulas or symbols

Yes

Logical system

syllogistics

Edge description

Style

Diagram is colored

No

Diagram is embellished

No