How a Linear Map Becomes a Matrix
Why does the column-by-column rule force the derivative to become a 2×3 matrix — and how do eigenvector bases turn projections diagonal?
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Feynman technique
Learn with the Feynman Technique
Explain each idea in your own words in handwriting, then upload a photo for AI critique. Two attempts per question — there's no "right" answer, only depth of understanding.