Singular Propositions, Negation and the Square of Opposition (2016), p. 221
by Choudhury, Lopamudra; Chakraborty, Mihir Kumar

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Logic

Aristotelian family

Sherwood-Czeżowski Sigma-3

Boolean complexity

4

Number of labels per vertex (at most)

1

Uniqueness of the vertices up to logical equivalence

Yes

Errors in the diagram

No

Geometry

Shape

Hexagon (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

iconic

Edge description

Style

Diagram is colored

No

Diagram is embellished

No