[SIGCIS-Members] How did the Incas calculate with yupanas?

[Bernardo Batiz-Lazo]

Hello Herbert 
It's a contested subject. But you might want to see the work of Gary Urton (Harvard) or Michael Hudson (Missouri @ Kansas City).
Hope this helps 
Bernardo 
(Northumbria)

Sent from my iPhone. Please excuse my brevity.

> On 6 Feb 2022, at 03:59, herbert.bruderer at bluewin.ch wrote:
> 
> 
> Dear colleagues:
> 
> The Romans used the abacus for calculations and recorded the results with Roman numerals.
> 
> The Incas recorded the values with quipus and calculated with yupanas.
> 
> Does anyone know how they calculated with these tools?
> 
> Many thanks.
> 
> Best wishes,
> 
> Herbert Bruderer
> 
> -- 
> Bruderer Informatik
> Seehaldenstrasse 26
> Postfach 47
> CH-9401 Rorschach
> Switzerland
> Telefon +41 71 855 77 11 
> 
> 
> Bruderer, Herbert [2020a]: Milestones in Analog and Digital Computing, Springer Nature Switzerland AG, Cham, 3rd edition 2020, 2 volumes, 2113 pages, 715 illustrations, 151 tables, https://www.springer.com/de/book/9783030409739
> 
> Bruderer, Herbert [2020b]: Meilensteine der Rechentechnik, De Gruyter Oldenbourg, Berlin/Boston, 3. Auflage 2020, Band 1, 970 Seiten, 577 Abbildungen, 114 Tabellen, https://www.degruyter.com/view/title/567028?rskey=xoRERF&result=7
> 
> Bruderer, Herbert [2020c]: Meilensteine der Rechentechnik, De Gruyter Oldenbourg, Berlin/Boston, 3. Auflage 2020, Band 2, 1055 Seiten, 138 Abbildungen, 37 Tabellen, https://www.degruyter.com/view/title/567221?rskey=A8Y4Gb&result=4
> 
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> 
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