We obtain a three-parameter q-series identity that generalizes two results of Chan and Mao. By specializing our identity, we derive new results of combinatorial significance in connection with N(r,s,m,n), a function counting certain overpartition pairs recently introduced by Bringmann, Lovejoy and Osburn. For example, one of our identities gives a closed-form evaluation of a double series in terms of Chebyshev polynomials of the second kind, thereby resulting in an analogue of Euler's pentagonal number theorem. Another of our results expresses a multi-sum involving N(r,s,m,n) in terms of just the partition function p(n). Using a result of Shimura we also relate a certain double series with a weight 7/2 theta series.
Dixit, Atul, and Ankush Goswami. "Combinatorial identities associated with a bivariate generating function for overpartition pairs." Advances in Applied Mathematics 143 (2023): 102444. https://doi.org/10.1016/j.aam.2022.102444
Advances in Applied Mathematics