Kidsらが私塾の老先生に習っている古代数学について少し話してくれた。
古代ギリシャの幾何学過剰（Euclid原論）と異なり、あれだけ代数学を展開できた古代バビロニア（Diophantus）が何故記数法でかくも劣っているというか初等的なのか？という講義という。
粘土に印鑑のようにベタベタと押しやすいためかな？
Babylonian numbers
Here are some funny math interesting facts. This will help you to knew about the ancient Babylonian numerals.
easycalculation.com/funny/numerals/images/babylonian/numbers
Babylonians were the first people to develop the written number system. Their number system is based on Sexagesimal System. It appeared around 1900 BC to 1800 BC.
The Babylonian number system had only two basic elements; l and < .
59 numbers are built from these two symbols.