# Talk:Counting rods

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## Source wanted

I haven't found the negative forms of 4, 5, 9 of the Southern Song rod numerals, and I can list only their positive forms. - TAKASUGI Shinji (talk) 18:33, 18 December 2007 (UTC)

## Just Integers?

How are fractions and complex numbers represented? 75.118.170.35 (talk) 01:03, 1 February 2009 (UTC)

• 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

Katsuyo Sampo tabulation of Pascal's triangle with rod numerals

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

The meaning of horizontal and vertical form is unclear. --Apoc2400 (talk) 00:17, 21 December 2009 (UTC)

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 24.56.153.216 (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 82.32.37.89 (talk) 23:44, 29 October 2012 (UTC)