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How can a modern anthropologist embark upon a generalization with any hope of arriving at a satisfactory conclusion? By thinking of the organizational ideas that are present in any society as a mathematical pattern.
Rethinking Anthropology, 1961.
On Triangles, by Regiomontanus
This is the title page of On Triangles by Regiomontanus (Johannes Müller) (1436-1476). Although the work was written in 1464, it was not published until 1533. The page can be translated as follows:
A complete translation and analysis of On Triangles is available in Baranabas Hughes, trans., Regiomontanus on Triangles (Madison: University of Wisconsin Press, 1967).