Ito's conjecture on the mean absolute value of elliptic Dedekind sums

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Let K2(X)K_2(X) be the Farey set of elements a/ca/c in the class-number-one imaginary quadratic field with discriminant parameter D=2D=2 and ∣c∣2<X|c|^2<X, and let

B2:={z=x+iy:0≤x<1, 0<y≤12}.B_2:=\{z=x+iy:0\leq x<1,\ 0<y\leq \frac{1}{\sqrt{2}}\}.

For the normalized elliptic Dedekind sum D~(a,c)\tilde{\mathfrak{D}}(a,c), Ito's conjecture.

lim⁡X→∞1#(K2(X)∩B2)∑ac∈K2(X)∩B2∣D~(a,c)∣=∞.\lim_{X\to\infty}\frac{1}{\#(K_2(X)\cap B_2)}\sum_{\frac{a}{c}\in K_2(X)\cap B_2}\left|\tilde{\mathfrak{D}}(a,c)\right|=\infty.

Ito formulated this conjecture from numerical experiments for D=2D=2. The paper proves it as an immediate corollary of its Gaussian limiting-distribution theorem for suitably normalized Sczech sums.

References

Primary source

Matteo Bordignon and Paolo Minelli, “The Limiting Distribution of Elliptic Dedekind Sums”, arXiv:2604.17077 (2026).

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