You're using an ancient browser to surf the modern web. Please update to the latest version (and don't use Internet Explorer!).

Leonardi.DB
a logical geometry project

On the Transformations of the Square of Opposition from the Point of View of Institution Model Theory (2022), p. 287
by Kiouvrekis, Yiannis; Stefaneas, Petros; Vandoulakis, Ioannis M.

Caption

Second Morphism square

Logic

Aristotelian family
Classical Sigma-2
Boolean complexity
3
Number of labels per vertex (at most)
1
Errors in the diagram
No

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

Edge description

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

Style

Diagram is colored
No
Diagram is embellished
No
↑ Back to top ↑