## Lecture 1 | The Language of Differential Equations

**Part 1 | What is a Differential Equation?**

**Definitions:**Differential equation, ordinary differential equation, and partial differential equation

**Part 2 | The Order of a Differential Equation**

**Definition:**Order of a differential equation

**Part 3 | Common Forms for Differential Equations**

**Definitions:**General/Implicit form, normal/explicit form, standard form, differential form, linear differential equation, and non-linear differential equation