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Leonardi.DB
a logical geometry project

Turnstile Figures of Opposition (2022), p. 231
by Beziau, Jean-Yves

Caption

Simple turnstile tautological triangle of contrariety

Logic

Number of labels per vertex (at most)
1
Errors in the diagram
No

Geometry

Shape
Triangle (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
symbolic
Symbolic field
logic
Contains partial formulas or symbols
No
Logical system
propositional logic

Edge description

Contains definitions of relations
No
Form
solid lines
Has arrowheads
No
Overlap
No
Curved
No
Hooked
No
As wide as vertices
No
Contains text
No
Label type
none

Style

Diagram is colored
Yes
Diagram is embellished
No
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