Examples:

1. Which of the following are ordinary differential equations?
   a.
   b.
   c.
   

   a. YES, linear first order ODE
   b. YES, linear second order ODE, "wave equation"
   c. NO, linear partial differential equation, "time dependent or transient diffusion equation"
   

2. What is the solution of an ODE?
   A function
3. Give two examples of common engineering subjects that involve the solution of ODEs.
   Radiactive decay
   Chemical kinetics
   Mechanics (dynamics)
   Control theory
   Population dynamics
   Diffusion
   Transient electrical circuits