Holomorphic functions (differentiable over complex numbers) define conformal maps, which are angle-preserving. | Visual Math

Conformal mapping is a powerful technique in complex analysis that involves transforming one region of the complex plane into another in a way that preserves angles. This means that if two curves intersect at a certain angle in the original plane, their images under the mapping will intersect at the same angle in the new plane. Conformal maps are generally defined by functions that are holomorphic and have nonzero derivatives, and they are widely used to simplify difficult geometric or physical