Srinivasa Ramanujan sent a sequence to G.H.Hardy in Cambridge:

1-5*(1/2)^3+p((1*3)/(2*4))^3-13((1*3*5)/(2*4*6))^3 + ...= 2/Pi

Any information about this infinite sequence is greatly appreciated...

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- October 12th 2005, 03:27 AMmitum2/Pi
Srinivasa Ramanujan sent a sequence to G.H.Hardy in Cambridge:

1-5*(1/2)^3+p((1*3)/(2*4))^3-13((1*3*5)/(2*4*6))^3 + ...= 2/Pi

Any information about this infinite sequence is greatly appreciated... - October 20th 2005, 08:59 PMniva
Hardy said of Ramanujan's formulas, some of which he could not initially understand, that "a single look at them is enough to show that they could only be written down by a mathematician of the highest class. They must be true, for if they were not true, no one would have had the imagination to invent them."

found this from wikipedia.org. http://en.wikipedia.org/wiki/Ramanujan

also 1/Pi - November 6th 2005, 05:06 PMThePerfectHacker
I have never been able to understand how Ramanujuan was able to derive those limits.