In this paper, we discuss the relationship between the local (infinitesimally) non-decreasability and the global (infinitesimally) non-decreasability of Beltrami coefficients, and give a method to construct a family of (infinitesimally) non-decreasable Beltrami coefficients which are extremal and of non-constant absolute values.
Ze Min ZHOU,Ji Xiu CHEN.
Quasiconformal Mappings with Non-Decreasable Beltrami Coefficients. Acta Mathematica Sinica, Chinese Series, 2003, 46(2): 379-384 https://doi.org/10.12386/A2003sxxb0052