A growing shelf of visual study guides. Every guide takes one idea and goes all the way down — the picture first, then definitions, worked examples, common traps, a practice set, and an interactive lab. No builds, no login: each guide is a single self-contained page.
Distance-first: read |x − a| as a distance, split every equation and inequality into "and / or" cases, dodge the classic traps, and finish with tolerances and a live distance lab.
Game-first: the ε–δ definition as a two-player game — a Challenger names a tolerance ε, the Defender answers with a window δ. Learn the game and full proofs fall out of it.
Derivatives, integrals, sequences… this shelf grows as new concepts get the full treatment.
Calculus Deep Dives · Study Library · distance-first & game-first guides