Some lecture notes I typed for the course ENGG2420B “Complex analysis and Differential Equations for Engineering”:

- First-order differential equation
- Second-order differential equation with constant coefficients
- Example of modeling with differential equations
- Non-homogeneous ODE with constant coefficients
- ODE in differential form
- A worked example of higher-order ODE
- Wave equation and the method of separating variables
- Solving the wave equation by Fourier sine series