Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
(a) Rectangle with isotropic growth rate increasing exponentially from left to right gives a curved final shape. (b) Flat disk with isotropic growth rate greater at the margins than at the center results in bending out of the plane and a wavy edge.
