CHAPTER XLII — Critical Commentary & Notes

How the Tetracedron Is Formed in the Ycocedron.

Historical & Mathematical Commentary

• Chain of Three Inscriptions: Notice the genealogical chain of reductions: Icosahedron \(\supset\) Dodecahedron (XV.6, 20 vertices at face-centers) \(\supset\) Cube (XV.7, 8 of those 20 vertices) \(\supset\) Tetrahedron (XV.2/XV.8, 4 of those 8 vertices).

Philological and Folio Apparatus

• 1509 Paganini Witness Folios: 0042 (f. 13v–f. 13v)

• Winterberg 1889 Italian Source: winterberg/01_divina_proportione_italian/042_cap_XLII.txt

• Winterberg 1889 German Source: winterberg/03_divina_proportione_german/042_cap_XLII.txt

• Marginal Woodcut Diagrams: 0 figure(s) extracted from the 1509 Venice witness.