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Leonardi.DB
a logical geometry project

Logic. Part I (1921), p. 136
by Johnson, W. E.

Copyright according to our policy

Logic

Aristotelian family
Buridan Sigma-4
Boolean complexity
4
Number of labels per vertex (at most)
1
Uniqueness of the vertices up to logical equivalence
Yes
Errors in the diagram
No

Geometry

Shape
Octagon (regular)
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

Edge description

Style

Diagram is colored
No
Diagram is embellished
No
Tags
existential import
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