Constructie van de 257-hoek:
Friedrich Julius Richelot
(1808-1875) en Schwendenwein construeerden in 1832 de 257-hoek.
Literatuur:
"De resolutione algebraica aequationis x257 = 1, sive de divisione circuli per bisectionem anguli septies repetitam in partes 257 inter se aequales commentatio coronata"
In: Journal für die reine und angewandte Mathematik. Nr. 9, 1832, S. 1–26, 146–161, 209–230, und 337–358.
Facsimile of the manuscript of Richelot

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