Get inspired:

By the end of this lesson, you should be able to:

• Explain what a conservative system is.
• Find a conserved quantity for a conserved system and use it to plot trajectories.
• Identify special cases where linear centers are guaranteed to be nonlinear centers

Before class, please:

• Read Strogatz, Sections 6.5, 6.7.
• Watch Strogatz’s lecture.
• Read these notes and these notes.
• Check yourself before you wreck yourself (none)

In class, we will:

• Work on this activity (key).

After class, please:

• Do post-class problems.