# The Square of Opposition in Catholic hands: a chapter in the history of 20th-century logic (2016), p. 11

by Jaspers, Dany; Seuren, Pieter A. M.

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### Caption

- System S$^{\text{12NR}-}$ (a) as a (non-complete) dodecagon, (b) reduced to a decagon.

- Aristotelian family
- Sigma-5 Graph
- Number of labels per vertex (at most)
- 2
- Equivalence between (some) labels of the same vertex
- Yes
- Analogy between (some) labels of the same vertex
- No
- Uniqueness of the vertices up to logical equivalence
- Yes
- Errors in the diagram
- No
- Shape
- Decagon (regular)
- Colinearity range
- 0
- Coplanarity range
- 0
- Cospatiality range
- 0
- Representation of contradiction
- By central symmetry

### Logic

### Geometry

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

### Vertex description

### Edge description

- Diagram is colored
- No
- Diagram is embellished
- No
- Tags
- Leuven

### Style

### Additional notes

- Another visualization occurs on p. 11; cf. here.