Non-real zeros of derivatives
arXiv:2105.11762
Abstract
A number of results are proved concerning non-real zeros of derivatives of real meromorphic functions. In particular, the paper supersedes the previous arXiv submission "Non-real zeros of linear differential polynomials in real meromorphic functions".
arXiv admin note: substantial text overlap with arXiv:1905.12288. Author's comment: this paper supersedes arXiv:1905.12288, in that it proves stronger results in a wider setting. The current version incorporates a number of minor corrections and clarifications, and is the final accepted version of the paper, to appear in the journal Computational Methods and Function Theory