An Arithmetization of Logical Oppositions (2017), p. 222
by Schang, Fabien

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Legend

Logic

Aristotelian family

Sigma-5 Graph

Boolean complexity

4

Number of labels per vertex (at most)

1

Uniqueness of the vertices up to logical equivalence

No

Errors in the diagram

No

Geometry

Shape

Hexagon (irregular)

Colinearity range

0–6

Coplanarity range

3

Cospatiality range

0

Representation of contradiction

By some other geometric feature

Vertex description

Conceptual info

No

Mnemonic support (AEIO, purpurea ...)

No

Form

none

Label type

symbolic

Symbolic field

logic

Contains partial formulas or symbols

No

Logical system

propositional logic

Edge description

Contains definitions of relations

No

Form

solid lines

Has arrowheads

Yes

Overlap

No

Curved

No

Hooked

No

As wide as vertices

No

Contains text

No

Label type

none

Style

Diagram is colored

Yes

Diagram is embellished

No

Additional notes

From the CO-perspective, this is a C4O1 diagram. (Two strong JSB sigma-3's that are intertwined with each other.)