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.
The solid line indicates a piecewise linear approximation to the zero level set of the signed distance function. The black points labeled ci,j indicate values that lie on a Cartesian grid. White points labeled indicate values associated with the boundary.
