Beltrami Differential Equation

For a measurable function $\mu$, the Beltrami differential equation is given by

$$f_{z^*}=\mu f_z,$$

where $f_z$ is a Partial Derivative and $z^*$ denotes the Complex Conjugate of $z$.

See also Quasiconformal Map

References

Iyanaga, S. and Kawada, Y. (Eds.). Encyclopedic Dictionary of Mathematics. Cambridge, MA: MIT Press, p. 1087, 1980.