Least squares linear and quadratic approximations

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  1. Alexei Davydov
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I like many of the YouTube math videos, some of which are spectacular, and beautiful -- the product of much work and organization and preparation. You have some stiff competition.

First, what is a least squares linear or quadratic approximation? I was hoping that your video would give me the answer. Instead, you go right into calculation -- essentially just arithmetic. How was this supposed to inspire me?

Second, the freehand printing with a light pen on a white board was difficult to read. Why not use colorful markers or computer print-outs or even computer programs that produce mathematical animations? You will then begin to gain followers.

r.w.emersonii