Carathéodory theorems for Slice Regular Functions
arXiv:1410.4300
Abstract
In this paper a quaternionic sharp version of the Carathéodory theorem is established for slice regular functions with positive real part, which strengthes a weaken version recently established by D. Alpay et. al. using the Herglotz integral formula. Moreover, the restriction of positive real part can be relaxed so that the theorem becomes the quaternionic version of the Borel-Carathéodory theorem. It turns out that the two theorems are equivalent.
arXiv admin note: text overlap with arXiv:1404.3117 by other authors