Concept clusters
Related ideas that live chapters apart, pulled onto one page — every factoring technique, every way to solve a quadratic, and more.
Which Fourier tool do you need?
Periodic or not, continuous or sampled -- the four representations this course builds, and when each applies.
12 concepts →
Choosing a Fourier series expansion
Full series, sine series, cosine series, or half-range -- picked by your function's symmetry and domain, not by habit.
7 concepts →
The Fourier transform computation toolkit
Build a new transform from a known one -- six properties and five standard pairs, side by side, so almost nothing needs a fresh integral.
10 concepts →