Eventual monotonicity conjecture for generalized partition ratios

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Let A⊂Z>0A\subset\mathbb{Z}_{>0}, let p(k)(n)p^{(k)}(n) be the generalized partition functions associated with AA, and define

ρ(k)(n)=p(k+1)(n)p(k)(n)=p(k)(n)−p(k)(n−1)p(k)(n).\rho^{(k)}(n)=\frac{p^{(k+1)}(n)}{p^{(k)}(n)}=\frac{p^{(k)}(n)-p^{(k)}(n-1)}{p^{(k)}(n)}.

Assume that AA has properties Pk+1,Pk+2,…P_{k+1},P_{k+2},\dots. Eventual monotonicity conjecture. The sequence ρ(k)(n)\rho^{(k)}(n) is eventually strictly decreasing.

This conjecture generalizes the eventual log-concavity of the classical partition function and would establish eventual monotonicity of the ratios for generalized partition functions under the stated property assumptions. The case A=Z>0A=\mathbb{Z}_{>0} and k=0k=0 follows from the eventual log-concavity theorem of DeSalvo and Pak, while the general case remains open in the supplied context.

References

Primary source

Carlos Castaño-Bernard and Florian Luca, “On Petersson's partition limit formula”, arXiv:2011.14601 (2020).

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