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 schematic illustration of 3-D state space. In this example, a system is fully described by 3 state variables. At any given moment, the system is represented as a point (state) in this space. The trajectory of the system traces out the time evolution of changes of the system’s state.
