# The Mandelbrot and Julia sets. Introduction.

We start with a Quick Tour around the Mandelbrot and Julia sets. If you are not bored to death you can proceed with the rest.

The Mandelbrot set is made by iteration of the complex map (function) zn+1 = zn2 + C for different C and zo = 0. Points on the parameter plane C with bounded zn form the Mandelbrot set (the black region on these pictures). Color outside the Mandelbrot set shows, how fast zn go to infinity.
The Mandelbrot set contains small copies of the "main cardioid" (in the white square) shown on the right picture. These small copies are connected with the main cardioid by filaments which are formed by other tiny cardioids. These strucrures are called the "Mandelbrot hair" or filaments. click mouse to explore images (Controls)

Each point C in the parameter space specifies the geometric structure of the corresponding Julia set J(C) in the dynamical plane z. If C1 is in the Mandelbrot set, the Julia set is connected. If C2 is not in the Mandelbrot set, the Julia set is a Cantor dust. You see connected 'Douady's rabbit' and 'Cantor dust' below.
 You see that every J set is self-similar. But the most amazing thing is that the M's filaments and corresponding J set are similar too (see the right top and bottom images). And two more similar M and J sets below.

More fractals

Now we can go to a Julia orbit trip. 600x600 Mandelbrot set.

See also the Mandelbrot Set in Eric W. Weisstein's "World of Mathematics"

Contents     Next: Rotation Numbers and Internal angles of the M-bulbs
updated 4 October 2000