Andrews–Dixit–Schultz–Yee oddness conjecture for a double Lambert series

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Let

Y(q):=∑n=1∞∑m=1∞(−1)mq2nm+m(1−q2m−1)(1+qn).Y(q):=\sum_{n=1}^\infty\sum_{m=1}^\infty\frac{(-1)^m q^{2nm+m}}{(1-q^{2m-1})(1+q^n)}.

Here qq is a complex number with ∣q∣<1|q|<1, so the double Lambert series defines an analytic function in its domain of convergence. Andrews–Dixit–Schultz–Yee conjecture. The function Y(q)Y(q) is odd:

Y(−q)=−Y(q).Y(-q)=-Y(q).

The conjecture was proposed as an alternative route to proving the congruences for the overpartition function p‾ω(n)\overline{p}_\omega(n) at arguments 4n+34n+3 and 8n+68n+6. Its resolution is not specified in the supplied source material.

References

Primary source

Su-Ping Cui and Dazhao Tang, “Identities and transformations for Lambert series and double Lambert series”, arXiv:2604.08839 (2026).

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