In this paper, via the contraction mapping principle, we give a proof of a Bloch-type theorem for normalized harmonic Bochner–Takahashi K-mappings and for solutions to equations of the form , where P is a homogeneous differential operator with an analytic fundamental solution, that is, homogeneous elliptic operators with constant coefficients.
"On the Fixed Point Method and Bloch’s Theorem." Michigan Math. J. Advance Publication 1 - 26, 2021. https://doi.org/10.1307/mmj/20195829