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

Apuleius is better still: A correction to the square of opposition [De Interpretatione 180,19-181, 7 Thomas] (1990), p. 131
by Gombocz, Wolfgang Leopold

Copyright according to our policy

Caption

The Square of Names for the Pairs of Propositions

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
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 ...)
Yes

Edge description

Style

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