About this edition

Using the site

Question bank: press 1–4 to select, Enter to check, and N for the next question. Flashcards: press Space to reveal. Keyboard shortcuts pause while you are typing in a field.

All content and mathematical fonts are bundled. Lessons, checked answers, bookmarks and flashcard ratings are stored only in this browser. Moving the folder or switching browsers can give you a different progress record.

Mathematical typesetting: KaTeX, MIT licence, bundled in vendor/LICENSE-katex.txt.