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Leonardi.DB
a logical geometry project

Derivation and Counterexample. An Introduction to Philosophical Logic (1972), p. 72
by Lambert, Karel; van Fraassen, Bas

Logic

Aristotelian family
Classical Sigma-2
Boolean complexity
3
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
No
Uniqueness of the vertices up to logical equivalence
Yes
Errors in the diagram
No

Geometry

Shape
Rectangle (irregular)
Colinearity range
0
Coplanarity range
0
Cospatiality range
0
Representation of contradiction
By central symmetry

Vertex description

Conceptual info
No
Mnemonic support (AEIO, purpurea ...)
Yes
Form
none
Label type
symbolic
Symbolic field
mathematics
,
logic
Contains partial formulas or symbols
Yes
Logical system
syllogistics
Mathematical branch
set theory

Edge description

Style

Diagram is colored
No
Diagram is embellished
No

Additional notes

'o' stands for 'overlap'; 'os' stands for 'extends outside' (cf. p. 70).
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