![](/diagrams/englebretsen_1984_quadratum-auctum_1dubbbml7_p-322_1edtjncte/images/display.jpeg?url=http%3A%2F%2Fpurl.org%2Flg%2Fdiagrams%2Fenglebretsen_1984_quadratum-auctum_1dubbbml7_p-322_1edtjncte%2Fimages%2Fdisplay.jpeg)
Quadratum auctum (1984), p. 322
by Englebretsen, George
![]( /diagrams/englebretsen_1984_quadratum-auctum_1dubbbml7_p-322_1edtjncte/images/display.jpeg?url=http%3A%2F%2Fpurl.org%2Flg%2Fdiagrams%2Fenglebretsen_1984_quadratum-auctum_1dubbbml7_p-322_1edtjncte%2Fimages%2Fdisplay.jpeg )
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- Aristotelian family
- Non-Sigma
- Boolean complexity
- 5
- Number of labels per vertex (at most)
- 1
- Uniqueness of the vertices up to logical equivalence
- Yes
- Errors in the diagram
- No
- Shape
- Hexagon (irregular)
- Colinearity range
- 0
- Coplanarity range
- 0
- Cospatiality range
- 0
- Representation of contradiction
- N.A.
Logic
Geometry
- Conceptual info
- Yes
- 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
Style
Additional notes
- The negation closure of this diagram (which is obtained by adding the negations of a and e) is a Lenzen sigma-4.