Conjecture on log-concavity of the signed binomial-Eulerian polynomials
For , let denote the -binomial-Eulerian polynomial, and specialize it at to obtain the signed binomial-Eulerian polynomial . A polynomial is log-concave when its coefficients satisfy for the relevant indices .
The signed log-concavity conjecture. The polynomial is log-concave for .
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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