Use Turbo! - Shift-click the green flag Press space to redraw Adjust variables using the sliders.
https://en.wikipedia.org/wiki/Mandelbrot_set A line-by-line explanation of the calculations is in the project. Click "See inside"! Here is the mathematical definition: For each point c in the complex plane, Let z=0; Let z1=z^2+c; Let z2=z1^2+c; Let z3=z2^2+c; And so on. If the sequence of z's does not diverge- that is, if for no z, |z|>2, the point c is in the Mandelbrot Set.