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What you get451
371 explainers
Paper walkthroughs and from-the-basics explainers. Three new ones every day
26 textbook chapters
Semiconductors, AI and the maths, in an order you can read straight through
48 student units
From primary arithmetic to work. With practice questions and the jobs that use them
6 close readings
Read the original English. Tap any word for what it means here
Interactive figures
Figures you can drag. A Three.js self-attention lab
Notes and asking the AI
Stick a note anywhere. Questions and answers are visible to everyone
What's free
Every listing, heading and opening is free to read. Notes, comments and asking the AI only need a sign-in.
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