A hyperbolic lower bound for the Kilbas–Saigo function at the boundary parameter

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Let α∈(0,1]\alpha\in(0,1], m>0m>0, and x≥0x\geq 0. Define the Kilbas–Saigo function Eα,m,lE_{\alpha,m,l} by its usual power series, and let GG denote the Barnes-type function used in the source. The conjectured lower bound. One has

Eα,m,m−1α(−x)≥1(1+(αm)−αm+1(Γ(1+α)G(1−α;αm)G(1+α;αm))−mm+1x)1+1m.E_{\alpha,m,m-\frac{1}{\alpha}}(-x)\geq \frac{1}{\left(1+(\alpha m)^{-\frac{\alpha}{m+1}}\left({\Gamma}(1+\alpha)G(1-\alpha;\alpha m)G(1+\alpha;\alpha m)\right)^{-\frac{m}{m+1}}x\right)^{1+\frac{1}{m}}}.

This is expected to complement the preceding uniform upper bound at the boundary value l=m−1/αl=m-1/\alpha; the source indicates that the constant is suggested by the asymptotic behaviour of the associated density, but does not establish the inequality.

References

Primary source

Lotfi Boudabsa and Thomas Simon, “Some properties of the Kilbas-Saigo function”, arXiv:2012.05666 (2020).

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