Reference 2

1. Introduction and Fundamentals

1.1 Definitions and Classification of Differential Equations (DEs)

Ordinary Differential Equations (ODEs) involve functions of a single variable and their ordinary derivatives, modeling systems with one dimension (e.g., time). Partial Differential Equations (PDEs) involve partial derivatives of multi-variable functions, modeling complex, multi-dimensional systems like heat transfer, wave propagation, and fluid flow 

1.2 Concept of a Solution to a Differential Equation

2. Techniques for Solving First-Order Differential Equations

2.1 Separable Equations

2.2 Exact Differential Equations

Solutions of Exact Equations