Skip to content
Free public beta until December 4, 2026: every course is open, no card needed. After that, the first chapter of each course stays free and full access is a one-time $39 ($19 for up to 100 founding members chosen for helpful feedback). Your progress is kept. How the beta works

partial-differential-equations

The Green's function for the wave equation

taught

Derive the wave equation's own Green's function by feeding a unit velocity impulse into d'Alembert's formula, producing a constant-height wedge.

Taught in