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Leonardi.DB
a logical geometry project

Oppositions and Opposites (2012), p. 160
by Schang, Fabien

Copyright according to our policy

Caption

Piaget’s four quaterns and their logical values in QAS

Logic

Aristotelian family
Classical Sigma-2
Boolean complexity
3
Number of labels per vertex (at most)
1

Geometry

Shape
Square (regular)
Colinearity range
0
Coplanarity range
0
Cospatiality range
0
Representation of contradiction
By central symmetry

Vertex description

Conceptual info
No

Edge description

Style

Diagram is colored
No
Diagram is embellished
No

Additional notes

This diagram is flipped, with the subcontrariety at the top edge and the contrariety at the bottom edge.
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