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.
Examples of simple rank 1 and rank 2 topologies. (a) A rank 1 topology with one O-C link. (b) A rank 2 topology with two O-C links. (c) A rank 2 topology with four O-C links. (d) A rank 2 topology with five O-C links. Both c and d can accommodate only two independent O-C links.
