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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
← Challenges 📅 Daily hard

recall a convolution or kernel formula

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Fill in every blank from memory. There is no clock; accuracy is the whole score.

2 blanks

Nailed it. of — points.

of . Here's what was missing:

+ XP

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