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• 214 Please explain the intuition behind the dual problem in optimization.
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• 80 What are some examples of mathematics that had unintended useful applications much later?
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• 49 What was Feynman's "much better way of presenting the electrodynamics" -- which did **not** appear in the Feynman lectures?
• 49 Why do we use trig functions in Fourier transforms, and not other periodic functions?
• 38 How do you prove that $\{ Ax \mid x \geq 0 \}$ is closed?
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