Differential equations
3 resources
▶ YouTube
Single video
But what is a differential equation? - intro context
A 20-minute visual answer to what differential equations are and why they appear everywhere in science.
▶ YouTube
Video series
Differential Equations - 3Blue1Brown
Eight visually stunning videos building geometric intuition for ODEs phase portraits and Fourier series.
⬡ Website
Video series
Problem sets & exercises
Differential Equations - Khan Academy
Self-paced introduction to ODEs covering separable equations integrating factors systems and Laplace transforms.