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Leonardi.DB
a logical geometry project

The Exact Intuitionistic Meaning of the Square of Opposition (2017), p. 292
by Vidal-Rosset, Joseph

Caption

Implications valid in CFOL

Logic

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

Geometry

Shape
Square (regular)
Colinearity range
0
Coplanarity range
0
Cospatiality range
0
Representation of contradiction
N.A.

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
predicate logic

Edge description

Contains definitions of relations
No
Form
none
,
double solid lines
Has arrowheads
Yes
Overlap
Yes
Curved
No
Hooked
No
As wide as vertices
No
Contains text
No
Label type
none

Style

Diagram is colored
No
Diagram is embellished
No
Tags
existential import

Additional notes

The negation closure of this diagram is a classical sigma-2.
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