The Elements of Formal Logic (1965), p. 332
by Hughes, George E.; Londey, David
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- 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 ...)
- No
- Form
- none
- Label type
- symbolic
- 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
- No
- Label type
- none
Vertex description
Edge description
- Diagram is colored
- No
- Diagram is embellished
- No
- Tags
- existential import
Style
Additional notes
- (1a) $\exists S . \sim\exists(S.\overline{P})$ (cf. A!)
(2a) $\exists S . \sim\exists(S.P)$ (cf. E!)
(3a) $\sim\exists S \vee \exists(S.P)$ (cf. I?)
(4a) $\sim\exists S \vee \exists(S.\overline{P})$ (cf. O?)
(1) $\sim\exists(S.\overline{P})$ (cf. A?)
(2) $\sim\exists(S.P)$ (cf. E?)
(3) $\exists(S.P)$ (cf. I!)
(4) $\exists(S.\overline{P})$ (cf. O!)
Cf. p. 331.