The second q-analogue of Liu's Dwork congruence

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Let mm and nn be positive integers with n≡1  (mod⁡4)n\equiv1\;\allowbreak(\operatorname{mod}4) and n>1n>1, and let (a;q)k(a;q)_k denote the qq-shifted factorial. The q-analogue conjecture.

∑k=0mn−1(1+q4k+1)(q2;q4)k3(1+q)(q4;q4)k3qk≡[n]q2(q3;q4)(n−1)/2(q5;q4)(n−1)/2q(1−n)/2∑k=0m−1(12)k3k!3  (mod⁡Φn(q)2).\sum_{k=0}^{mn-1}\frac{(1+q^{4k+1})(q^2;q^4)_k^3}{(1+q)(q^4;q^4)_k^3}q^k \equiv \frac{[n]_{q^2}(q^3;q^4)_{(n-1)/2}}{(q^5;q^4)_{(n-1)/2}}q^{(1-n)/2}\sum_{k=0}^{m-1}\frac{(\frac12)_k^3}{k!^3}\;\allowbreak(\operatorname{mod}\Phi_n(q)^2).

This is presented as a different q-analogue of the first case of Liu's supercongruence and as a refinement of an earlier congruence.

References

Primary source

Victor J. W. Guo, “Dwork-type q-congruences through the q-Lucas theorem”, arXiv:2310.15207 (2023).

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