An interactive, visual playground — slope fields to chaos.
Every idea starts from something real — a cooling cup of coffee, a child on a swing, a switch that snaps — and is anchored to a picture you can play with. Drag the sliders, watch the animations, and edit and run the code, all in your browser. No install, no prerequisites beyond first-year calculus.
Chapters available today. Each reads top-to-bottom; expand any cell to edit and re-run its code right in the page.
The full arc — a standard undergraduate differential-equations course, built one interactive chapter at a time. ✓ available means you can read it today; ✎ draft means it's readable but still being written.
Not a PDF with a few plots bolted on.
Each chapter opens on a concrete phenomenon and builds the math out of it — the equation is derived, never dropped from the sky.
Sliders, 60-fps animations, draggable masses, an audible resonance curve. The intuition is something you do, not something you read.
Every figure is generated by Python you can edit and re-run in the browser — and an open playground in each chapter to try your own.
Hand-built animations walk the hard algebra step by step, so the "trust me" moments are kept to a minimum.