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Leonardi.DB
a logical geometry project

Between Square and Hexagon in Oresme's Livre du Ciel et du Monde (2020), p. 44
by Demey, Lorenz

Caption

(a) Oresme’s pentagon of opposition; (b) the actual pentagon in BnF Ms. franç. 1082, fol. 51r.

Logic

Aristotelian family
Non-Sigma
Boolean complexity
3
Number of labels per vertex (at most)
1
Uniqueness of the vertices up to logical equivalence
Yes
Errors in the diagram
No

Geometry

Shape
Pentagon (irregular)
Colinearity range
0
Coplanarity range
0
Cospatiality range
0
Representation of contradiction
N.A.

Vertex description

Conceptual info
No
Mnemonic support (AEIO, purpurea ...)
No
Form
none
Label type
linguistic
Language
French
Lexical field
modal syllogistics
Contains partial sentences or single words
Yes
Contains abbreviations
Yes

Edge description

Style

Diagram is colored
Yes
Diagram is embellished
No
Tags
Leuven

Additional notes

The negation closure of this diagram is a JSB sigma-3.
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