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- I have added a short paragraph on ancient presentation of fraction with rod numerals. There was no complex number concept in antiquity--11:02, 29 June 2011 (UTC)
Possibly useful illustration from 1712
I recently uploaded this facsimile of two pages of the Katsuyo Sampo of Japanese mathematician Seki Kowa, published in 1712. It includes a tabulation of binomial coefficients in rod numerals. I am posting here in case the editors of this page want to use it. —Dominus (talk) 19:45, 21 August 2009 (UTC)
Horizontal and vertical
Error in Example:
Rod Numerals: -6720 should have the seven hundred digit with the slash through it to represent a negative number, just as -407 does. This is true in both the Traditional and Southern Song examples. —Preceding unsigned comment added by 220.127.116.11 (talk) 13:09, 26 January 2011 (UTC)
Why use horizontal bars?
Take one of the examples, 5089.
In the second box from the left we have the numeral representing 80, three horizontal bars under a vertical. It is already in the 'tens' position, so why reiterate this? This usage also occurs in the other examples and in the photographs. — Preceding unsigned comment added by 18.104.22.168 (talk) 23:44, 29 October 2012 (UTC)