Supercongruence conjecture for hypercubic, hyper-octahedral and simplicial families

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Let FN(t)=∑n=0N−1fntnF_N(t)=\sum_{n=0}^{N-1}f_nt^n be the truncation of F(t)F(t) at tNt^N, and let t↦tσt\mapsto t^\sigma be the excellent Frobenius lift. The congruence

F(t)F(tσ)≡Fmps(t)Fmps−1(tσ)mod  ps\frac{F(t)}{F(t^\sigma)}\equiv \frac{F_{mp^s}(t)}{F_{mp^{s-1}}(t^\sigma)}\mod{p^s}

holds for every m,s≥1m,s\geq 1. Supercongruence conjecture. The same congruence holds modulo p2sp^{2s} for m=2m=2 in the hypercubic and hyper-octahedral families, and for m=n+1m=n+1 in the simplicial families. Numerical experiments support this strengthening, but it has not been proved for any example of gg in the source.

References

Primary source

Frits Beukers and Masha Vlasenko, “Dwork crystals III: from excellent Frobenius lifts towards supercongruences”, arXiv:2105.14841 (2023).

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