Fig. 11.
Illustration of an automorphism ϕ in the proof. The red path indicates (v 1,…,v n), where ϕ(v i)=v n−i+1 for all i=1,…,n
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.