Traité de logique (1918), p. 238
by Goblot, Edmond
Copyright according to our policy
- Aristotelian family
- Classical Sigma-2
- 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
- Shape
- Rectangle (irregular)
- 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
- linguistic ,
- symbolic
- Language
- French
- Lexical field
- propositional connectives
- Contains partial sentences or single words
- No
- Contains abbreviations
- Yes
- Symbolic field
- logic
- Contains partial formulas or symbols
- Yes
- Logical system
- syllogistics
- Contains definitions of relations
- No
- Form
- none
- Has arrowheads
- No
- Overlap
- No
- Curved
- No
- Hooked
- No
- As wide as vertices
- No
- Contains text
- Yes
- Label type
- linguistic
- Language
- French
- Contains partial sentences or single words
- Yes
- Contain abbreviations
- No
Vertex description
Edge description
- Diagram is colored
- No
- Diagram is embellished
- No
Style
Additional notes
- $p$ entraîne $q$ = $p \to q$
$p$ exclut $q$ = $p | q$ (Sheffer stroke), $p \to \neg q$
$p$ n'entraîne pas $q$ = $\neg(p \to q)$
$p$ n'exclut pas $q$ = $\neg(p | q)$ = $\neg(p \to \neg q)$
Note: the validity of this sigma-2 diagram requires the assumption that $p$ is true.