Solving the heat equation | DE3

Boundary conditions, and set up for how Fourier series are useful.
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More about the heat equation, with a derivation in terms of slope corresponding to heat flow from MIT OCW:
https://ocw.mit.edu/courses/mathematics/18-303-linear-partial-differential-equations-fall-2006/lecture-notes/heateqni.pdf

If you want to learn more about Fourier series, here are a few great videos/posts which I think you'll enjoy:
Mathologer's: https://youtu.be/qS4H6PEcCCA
The Coding Train: https://youtu.be/Mm2eYfj0SgA
Jez Swanson: http://www.jezzamon.com/fourier/

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If you want to check it out, I feel compelled to warn you that it's not the most well-documented tool, and it has many other quirks you might expect in a library someone wrote with only their own use in mind.

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Видео Solving the heat equation | DE3 канала 3Blue1Brown