Conjecture on log-concavity of the signed binomial-Eulerian polynomials

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For n≥1n\geq1, let A~n(t,q)\tilde{A}_n(t,q) denote the qq-binomial-Eulerian polynomial, and specialize it at q=−1q=-1 to obtain the signed binomial-Eulerian polynomial A~n(t,−1)\tilde{A}_n(t,-1). A polynomial h(t)=∑k=0naktkh(t)=\sum_{k=0}^na_k t^k is log-concave when its coefficients satisfy ak2−ak−1ak+1≥0a_k^2-a_{k-1}a_{k+1}\geq0 for the relevant indices kk.

The signed log-concavity conjecture. The polynomial A~n(t,−1)\tilde{A}_n(t,-1) is log-concave for n≥1n\geq1.

This is the second conjecture proposed in the closing remarks. The supplied text gives no evidence of a resolution, so its status remains open.

References

Primary source

Zhicong Lin, David G. L. Wang and Jiang Zeng, “Around the q-binomial-Eulerian polynomials”, arXiv:1812.09098 (2020).

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