Was Lewis Carroll an Amazing Oppositional Geometer? (2014), p. 389
by Moretti, Alessio

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Caption

The square emerges from an incompatibility, from an implication or from a disjunction. - (any contrariety) (i.e. any 'Sheffer's bar')

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

Digon (regular)

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

dots

Label type

generic placeholders

Edge description

Style

Diagram is colored

Yes

Diagram is embellished

No

Tags

existential import

Additional notes

The negation closure of this diagram is a classical sigma-2.