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A comment on Solving the heat equation: Differential equations, chapter 3 [video].
It shows the Fourier transform of the curve you draw, and how each summand decays through time.
There's also a wave equation toy: https://math.berkeley.edu/~kmill/toys/wave/wave.html
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It shows the Fourier transform of the curve you draw, and how each summand decays through time.
There's also a wave equation toy: https://math.berkeley.edu/~kmill/toys/wave/wave.html