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Leonardi.DB
a logical geometry project

The Square of Opposition in Action (1961), p. 57
by Doyle, John J.

Legend

Logic

Aristotelian family
Classical Sigma-2
Boolean complexity
3
Number of labels per vertex (at most)
1
Uniqueness of the vertices up to logical equivalence
Yes
Errors in the diagram
No

Geometry

Shape
Square (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
linguistic
Language
English
Lexical field
syllogistics
Contains partial sentences or single words
No
Contains abbreviations
Yes

Edge description

Style

Diagram is colored
No
Diagram is embellished
No

Additional notes

'Some' is here interpreted bilaterally (as 'some and some not').
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