Augustus De Morgan's Unpublished Octagon of Opposition (2022), p. 148
by Heinemann, Anna-Sophie; Demey, Lorenz
Copyright according to our policy
Caption
- De Morgan’s MS.776/1-90b
- Number of labels per vertex (at most)
- 1
- Errors in the diagram
- No
- Shape
- Octagon (irregular)
- Colinearity range
- 0–1
- Coplanarity range
- 10
- Cospatiality range
- 0
- Representation of contradiction
- By central symmetry
Logic
Geometry
- Conceptual info
- No
- Mnemonic support (AEIO, purpurea ...)
- No
- Form
- rectangular
- Contains definitions of relations
- No
- Form
- solid lines ,
- none ,
- triple solid lines
- Has arrowheads
- No
- Overlap
- No
- Curved
- No
- Hooked
- No
- As wide as vertices
- No
- Contains text
- No
- Label type
- none
Vertex description
Edge description
- Diagram is colored
- No
- Diagram is embellished
- No