Laguerre inequality threshold conjecture for the broken k-diamond partition function

Let Δk(n)\Delta_k(n) denote the broken kk-diamond partition function, and let Lm(an)L_m(a_n) denote the discrete Laguerre expression of order mm:

Lm(an)=12r=02m(1)r+m(2mr)an+ran+2mr.L_m(a_n)=\frac{1}{2}\sum_{r=0}^{2m}(-1)^{r+m}{2m\choose r}a_{n+r}a_{n+2m-r}.

Laguerre threshold conjecture. For k=1k=1 or 22 and 1m141\leq m\leq14, the sequence Δk(n)\Delta_k(n) satisfies the Laguerre inequality of order mm, namely Lm(Δk(n))0L_m(\Delta_k(n))\geq0, for nNΔk(m)n\geq N_{\Delta_k}(m), where

m1234567891011121314NΔ1(m)11253132251420639912124516362091261232013858NΔ2(m)11045106211354539774105913981781224027493318\begin{array}{c|rrrrrrrrrrrrrr} m&1&2&3&4&5&6&7&8&9&10&11&12&13&14\\ N_{\Delta_1}(m)&1&12&53&132&251&420&639&912&1245&1636&2091&2612&3201&3858\\ N_{\Delta_2}(m)&1&10&45&106&211&354&539&774&1059&1398&1781&2240&2749&3318 \end{array}

These are computationally proposed thresholds for extending the proved low-order Laguerre inequalities.

Sources & referencesView supporting material

Primary source

Eve Y. Y. Yang, “Laguerre inequality and determinantal inequality for the broken k-diamond partition function”, arXiv:2305.17864 (2023).

Additional references

3 papers in this index state this conjecture (2010–2023). The statement above is taken from the most recent of them; the others are arXiv:2207.13606, arXiv:1005.5186.

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