Leibniz's Logic and the ''Cube of Opposition'' (2016), p. 186
by Lenzen, Wolfgang

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Logic

Aristotelian family

Buridan Sigma-4

Boolean complexity

5

Number of labels per vertex (at most)

1

Uniqueness of the vertices up to logical equivalence

Yes

Errors in the diagram

No

Geometry

Shape

Cube (regular)

Colinearity range

0

Coplanarity range

0

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

Edge description

Style

Diagram is colored

Yes

Diagram is embellished

No

Additional notes

This sigma-4 diagram also occurs in John Buridan. See L. Demey, 2019, Boolean considerations on John Buridan's octagons of opposition, History and Philosophy of Logic, 40/2, pp. 116 - 134. doi:10.1080/01445340.2018.1531481