One of Ramanujan's infinite series is now the basis for methods used to compute Pi:
Ramanujan's equation arrives at values of Pi to large numbers of decimal places more rapidly than just about any other known series. Each extra term in the suumation adds around eight digits to the decimal expantion of Pi. Ramanujan also gave 14 other series for 1/Pi but offers little explanation of where they came from. Even now, with the help of a more theoretical understanding aided by mathematical tools such as computer software for manipulating algebric expressions, mathematicians still find it hard to generate the kind of identities that Ramanujan already found.
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