With the help of the partial derivative operator and several summation formulas for hypergeometric series, we find three double series for π. In terms of the operator just stated and several summation formulas for basic hypergeometric series, we also establish q-analogues of these double series.
Via the contour integral method, we establish several multidimensional Rogers-Ramanujan type identities with parameters. As conclusions, some known formulas are recovered and several new identities are derived. The bisection method is also used to discover some new results.
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