Turán transforms preserve eventually increasing shifted multiplier sequences

Let {γi}i0\{\gamma_i\}_{i\geq 0} be a shifted multiplier sequence that is eventually increasing, and define

Tj({γi}i0)={Tj(i)}i0.\mathcal{T}_j(\{\gamma_i\}_{i\geq 0})=\{T_j(i)\}_{i\geq 0}.

The Turán-transform preservation conjecture. For every jNj\in\mathbb{N}, the sequence Tj({γi}i0)\mathcal{T}_j(\{\gamma_i\}_{i\geq 0}) is again a shifted multiplier sequence that is eventually increasing. This ambitious statement would imply eventual positivity for arbitrary compositions of Turán inequalities; the source presents it as open.

Sources & referencesView supporting material

Primary source

Ian Wagner, “On a new class of Laguerre-Pólya type functions with applications in number theory”, arXiv:2108.01827 (2022).

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