Praktische Logik oder Denklehre (1872), p. 77
by Drbal, Mathias Amos

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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 some other geometric feature

Vertex description

Conceptual info

No

Mnemonic support (AEIO, purpurea ...)

Yes

Edge description

Style

Diagram is colored

No

Diagram is embellished

No

Additional notes

This is a 'twisted' square: the E- and O-corners have been switched with each other.