preprint-author: 
M. Shishikura
preprint-title: 
The Hausdorff Dimension of the Boundary of the Mandelbrot Set and Julia Sets
preprint-abstract: 

It is shown that the boundary of the Mandelbrot set $M$ has Hausdorff dimension two and that for a generic $c \in \partial M$, the Julia set of $z \mapsto z^2 + c$  also has Hausdorff dimension two. The proof is based on the study of the bifurcation of parabolic periodic points.

preprint-year: 
1991