Higher-order Turán inequality for the partition function

Let p(n)p(n) denote the number of partitions of the positive integer nn, and define

un=p(n+1)p(n1)p(n)2.u_n=\frac{p(n+1)p(n-1)}{p(n)^2}.

Higher-order partition-function inequality. For n2n\geq 2,

4(1νn)(1νn+1)<(1+π24n3/2)(1νnνn+1)2.4(1-\nu_n)(1-\nu_{n+1})<\left(1+\frac{\pi}{\sqrt{24}n^{3/2}}\right)(1-\nu_n\nu_{n+1})^2.

This is presented as a higher-order analogue of a conjecture of DeSalvo and Pak. The supplied text does not state that this inequality has been proved or disproved, so its resolution is unclear.

Sources & referencesView supporting material

Primary source

William Y. C. Chen, Dennis X. Q. Jia and Larry X. W. Wang, “Higher Order Turán Inequalities for the Partition Function”, arXiv:1706.10245 (2017).

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