The medieval theory of consequence (2012), p. 910
by Read, Stephen

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Legend

Logic

Aristotelian family

Buridan Sigma-4

Boolean complexity

6

Number of labels per vertex (at most)

2

Equivalence between (some) labels of the same vertex

No

Analogy between (some) labels of the same vertex

Yes

Uniqueness of the vertices up to logical equivalence

Yes

Errors in the diagram

No

Geometry

Shape

Rectangle (irregular)

Colinearity range

0–2

Coplanarity range

0

Cospatiality range

0

Representation of contradiction

By central symmetry

Vertex description

Label type

linguistic

,

symbolic

Language

English

Lexical field

modal syllogistics

Contains partial sentences or single words

No

Contains abbreviations

No

Symbolic field

logic

Contains partial formulas or symbols

No

Edge description

Style

Diagram is colored

No

Diagram is embellished

No

Tags

existential import

Additional notes

The symbolic notation is taken over from Paul Thom, 2003, Medieval modal systems. Farnham: Ashgate.