Extensions of Ramanujan's two formulas for $1/π$

Chuanan Wei, Dianxuan Gong

Published 2012-02-06Version 1

In terms of the hypergeometric method, we establish the extensions of two formulas for $1/\pi$ due to Ramanujan [27]. Further, other five summation formulas for $1/\pi$ with free parameters are also derived in the same way.