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Value edit
I see that three 9's have been deleted from the value, with a reference to Mathworld. I'm not a mathematician, but I'm given to understand that Mathworld is _not_ the most reliable of sources; my original value, with fifteen 9's, is from Barrow's book. Could someone find a definitive reference (or, indeed, calculate the value independently) and decide between the two? Tevildo 21:58, 12 March 2007 (UTC)
I've just asked mathematica, and the twelve 9s version is correct. --Mathish 12:04, 26 March 2007 (UTC)