### (32 min.) What are quaternions, and how do you visualize them? A story of four dimensions.

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### (10 min.) 3Blue1Brown – Backpropagation calculus | Appendix to deep learning chapter 3

February 19, 20183051
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### (14 min.) 3Blue1Brown – What is backpropagation really doing? | Chapter 3, deep learning

February 19, 20184871
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### (21 min.) 3Blue1Brown – Gradient descent, how neural networks learn | Chapter 2, deep learning

February 19, 20182512
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### (19 min.) 3Blue1Brown – But what *is* a Neural Network? | Chapter 1, deep learning

February 19, 20183841
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