The square of opposition (1976), p. 535
by Englebretsen, George

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Logic

Aristotelian family

Classical Sigma-2

Boolean complexity

3

Number of labels per vertex (at most)

1

Geometry

Shape

Rectangle (irregular)

Colinearity range

0

Coplanarity range

0

Cospatiality range

0

Representation of contradiction

By central symmetry

Vertex description

Mnemonic support (AEIO, purpurea ...)

No

Label type

linguistic

Language

English

Lexical field

negation

Contains partial sentences or single words

No

Contains abbreviations

Yes

Edge description

Style

Diagram is colored

No

Diagram is embellished

No