Final answer:
The specific analysis of Trachtenberg regarding the 6:4:2:3 proportions of Du Fay's motet Nuper rosarum flores is not detailed in the provided references. A deeper exploration of Renaissance music and symbolic numerology in Du Fay's work is suggested for this context.
Step-by-step explanation:
Trachtenberg's reading of the 6:4:2:3 proportions of Du Fay's motet Nuper rosarum flores is not explicitly provided in the query content. Instead, we need to understand the broader context of Renaissance music and the specific piece in question. Du Fay's motet, composed for the dedication of Florence's cathedral dome in 1436, reflects the architectural proportions of the dome through musical structure. Scholars often analyze these proportions, which could reflect various numerological or symbolic meanings, such as the Temple of Solomon references or Marian symbolism. However, as Trachtenberg's specific analysis is not available in the provided references, this aspect cannot be addressed definitively. It is important to consult academic sources that focus on Trachtenberg's work for a more accurate understanding of his interpretation of Du Fay's motet.