The Medieval Modal Octagon and the S5 Lewis Modal System (2012), p. 115
by Campos Benítez, Juan Manuel

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Caption

Buridan's Magna Figura ("Big Diagram"), as it appears in Johannes Buridanus: Compendium Totius Logicae, Venice, 1499, reprinted Minerva: Frankfurt/Main, 1965 (courtesy of Gyula Klima)

Logic

Aristotelian family

Buridan Sigma-4

Boolean complexity

6

Number of labels per vertex (at most)

9

Equivalence between (some) labels of the same vertex

Yes

Analogy between (some) labels of the same vertex

No

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

Conceptual info

No

Mnemonic support (AEIO, purpurea ...)

No

Form

none

Label type

linguistic

Language

Latin

Lexical field

modal syllogistics

Contains partial sentences or single words

No

Contains abbreviations

Yes

Edge description

Style

Diagram is colored

No

Diagram is embellished

No