分形(Fractal)是指具有自相似特性的现象、图像或者物理过程等。分形学诞生于1970年代中期，属于现代数学中的一个分支。-Fractal (Fractal) refers to the phenomenon of self-similar features, images, or physical processes. Fractal born in the mid-1970s, is a branch of modern mathematics.