Aristotelian Relations in PDL: The Hypercube of Dynamic Oppositions (2017), p. 403
by García-Cruz, José David

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Caption

Octagon of oppositions Buridan style $PDL^Q$

Logic

Aristotelian family

Buridan Sigma-4

Boolean complexity

6

Number of labels per vertex (at most)

1

Uniqueness of the vertices up to logical equivalence

Yes

Errors in the diagram

No

Geometry

Shape

Octagon (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 ...)

No

Form

none

Label type

symbolic

Symbolic field

logic

Contains partial formulas or symbols

No

Logical system

dynamic logic

Edge description

Style

Diagram is colored

Yes

Diagram is embellished

No

Additional notes

An alternative visualization occurs on p. 404; cf. here.