Quintuple product identity as a special case of ramanujan's 1ψ1 summation formula

摘要

In this note we observe an interesting fact that the well-kno\udwn quintuple product identity can be regarded as a special case of the celebrated 1ψ1 summation formula of Ramanujan\udwhich is known to unify the Jacobi triple product identity an\udd the q-binomial theorem.