A general partial-fraction relation for derivatives of an entire function

Let FF be the function under consideration, with zeros aka_k indexed by k0k\geq 0, let LL be the derivative order, let mm be a positive integer, and let ωm\omega_m denote an mmth root of unity. The notation F(L)()/F()F^{(L)}(\infty)/F(\infty) denotes the corresponding value at infinity when it exists. General partial-fraction relation. The following more general relation is conjectured:

F(L)(z)F(z)=F(L)()F()+k=0r=0m1F(L)(ak)F(ak)(ωmrzakωmr).\frac{F^{(L)}(z)}{F(z)}=\frac{F^{(L)}(\infty)}{F(\infty)}+\sum_{k=0}^{\infty}\sum_{r=0}^{m-1}\frac{F^{(L)}(a_{k})}{F'(a_{k})}\left(\frac{\omega_{m}^{r}}{z-a_{k}\omega_{m}^{r}}\right).

The proposed identity is intended to generalize the preceding recursion formula for the Hurwitz zeta function and the partial-fraction decompositions developed in the paper; its validity and the required hypotheses on FF, LL, mm, and convergence are not established in the supplied text.

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Primary source

Xiaowei Wang, “The summation of infinite partial fraction decomposition I: some formulae related to the Hurwitz zeta function”, arXiv:2102.04115 (2021).

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