Ramanujan's Identity
Ramanujan gave the identity
valid for |q| < 1 and |b/a| < |z| < 1. Similar identities for have been given by Bailey. Such identities can be understood to be generalizations of the Jacobi triple product theorem, which can be written using q-series as
Ken Ono gives a related formal power series
Read more about this topic: Basic Hypergeometric Series
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