Augustus De Morgan's Unpublished Octagon of Opposition (2022), p. 165
by Heinemann, Anna-Sophie; Demey, Lorenz

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Caption

Generic description of the type of KJ octagons

Logic

Number of labels per vertex (at most)

1

Errors in the diagram

No

Geometry

Shape

Octagon (irregular)

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

Form

dots

Edge description

Contains definitions of relations

No

Form

solid lines

,

none

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