Two Concepts of Opposition, Multiple Squares (2012), p. 127
by Kearns, John T.

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Caption

Incomplete universal-existential square of opposition

Logic

Aristotelian family

Non-Sigma

Number of labels per vertex (at most)

1

Uniqueness of the vertices up to logical equivalence

Yes

Errors in the diagram

No

Geometry

Shape

Triangle (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

symbolic

Symbolic field

logic

Contains partial formulas or symbols

No

Logical system

predicate logic

Edge description

Style

Diagram is colored

No

Diagram is embellished

No