Was Lewis Carroll an Amazing Oppositional Geometer? (2014), p. 406
by Moretti, Alessio

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Caption

Carroll-Richards' model, like Jacoby's and Dubois-Prade's, is a suboptimal model. - Jacoby's unfortunate geometrical solution (a complex triangle)

Logic

Aristotelian family

Jacoby-Sesmat-Blanché Sigma-3

Boolean complexity

3–4

Number of labels per vertex (at most)

0

Uniqueness of the vertices up to logical equivalence

Yes

Errors in the diagram

No

Geometry

Shape

Triangle (regular)

Colinearity range

1

Coplanarity range

0

Cospatiality range

0

Representation of contradiction

By diametric opposition (but no central symmetry)

Vertex description

Conceptual info

No

Mnemonic support (AEIO, purpurea ...)

No

Form

dots

Label type

none

Edge description

Style

Diagram is colored

Yes

Diagram is embellished

No

Tags

existential import