Craig–Pun's log-concavity and higher-order Turán conjecture for distinct partitions

Let q(n)q(n) denote the number of partitions of nn into distinct parts. Log-concavity means q(n)2q(n1)q(n+1)q(n)^2\geq q(n-1)q(n+1), and the higher-order Turán inequalities are the corresponding higher-order inequalities for this sequence.

Craig–Pun's conjecture. The function q(n)q(n) is log-concave for n33n\geq33 and satisfies the higher-order Turán inequalities for n121n\geq121.

The paper presents this as a conjecture of Craig and Pun. Its status is not resolved in the supplied material, although the paper notes that the higher-order inequalities hold for sufficiently large nn.

Sources & referencesView supporting material

Primary source

Janet J. W. Dong and Kathy Q. Ji, “Higher Order Turan Inequalities for the Distinct Partition Function”, arXiv:2303.05243 (2023).

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