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Leonardi.DB
a logical geometry project

Groups, Not Squares: Exorcizing a Fetish (2017), p. 244
by Carnielli, Walter

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
Yes

Geometry

Shape
Rectangle (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
symbolic
Symbolic field
logic
Contains partial formulas or symbols
No
Logical system
propositional logic

Edge description

Contains definitions of relations
No
Form
solid lines
Has arrowheads
Yes
Overlap
No
Curved
No
Hooked
No
As wide as vertices
No
Contains text
Yes
Label type
linguistic
Language
English
Contains partial sentences or single words
Yes
Contain abbreviations
No

Style

Diagram is colored
No
Diagram is embellished
No

Additional notes

Cosubalternation is falsity preservation (cf. p. 243); the cosubalternations shown in this diagram are indeed correct.

However:
$\bullet \ \ p \vee q$ and $\neg p \vee \neg q$ are subcontraries, rather than contraries
$\bullet \ \ p \wedge q$ and $\neg p \wedge \neg q$ are contraries, rather than subcontraries
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