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Leonardi.DB
a logical geometry project

Studies and Exercises in Formal Logic (First Edition) (1884), p. 56
by Keynes, J. N.

Copyright according to our policy

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
Square (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 ...)
Yes

Edge description

Style

Diagram is colored
No
Diagram is embellished
No
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