 Posted Jan 10, 2001 by Gnomon [See A60420098 for details of new sign-in system] The Ancient Greeks knew about Pi, but they didn't give its present name. That was some English mathematician in the 18th century, as pointed out by "Joe".
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 Posted May 7, 2001 by e to the x Euler named it, along with introducing sigma notation for sums and hundreds of other notations.
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 Posted Mar 19, 2007 by iforhuw It was not an English Mathematician but Welsh.
He used it first in 1706 and Euler adopted it also but later in 1737.
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