Indian Math

This week's podcast of the BBC's radio show In Our Time is about Indian Math. Although it's very once-over-lightly, covering thousands of years and a lot of area in just 45 or so minutes, it covers a great deal the early developments in Indian, which included the use of zero, the concept of infinity, and the Pythagorean theorem (before Pythagoras), and the Arabic numerals. One weird fact: those numerals weren't allowed to be used in book-keeping in England until the 18th century. I guess they were still totaling them up with Roman numerals. Must have been annoying.