The Incan quipus
Quipus are a most intriguing element of the Inca civilization. The original use of these structured knotted cotton or wool cords are yet object of discussion. It seems they were registry systems, with quantitative and qualitative information, used for bureaucratic-administrative purposes. This paper, based mainly on the already classical studies of \textit{M. Ascher} and \textit{R. Ascher} [Code of the quipu. Ann Arbor: Michigan Univ. Press (1981; Zbl 0585.01001)] and of \textit{G. Urton} [The Social Life of Numbers. Austin: Univ. Texas Press (1997)], gives an interesting and well organized exposition of the quipus. The paper begins with a very brief historical introduction and then proceeds to describe the quipus, the way they are constructed, and their arithmetical content.
scientific article; zbMATH DE number 1901266