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/mathemati...

If you want to learn more about Fourier series, here are a few great videos/posts which I think you'll enjoy:
Mathologer's:    • Epicycles, complex Fourier series and...  
The Coding Train:    • Coding Challenge 125: Fourier Series  
Jez Swanson: http://www.jezzamon.com/fourier/

Thanks to these viewers for their contributions to translations
Hebrew: Omer Tuchfeld

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These animations are largely made using manim, a scrappy open source python library: https://github.com/3b1b/manim

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.

Music by Vincent Rubinetti.
Download the music on Bandcamp:
https://vincerubinetti.bandcamp.com/a...

Stream the music on Spotify:
https://open.spotify.com/album/1dVyjw...

If you want to contribute translated subtitles or to help review those that have already been made by others and need approval, you can click the gear icon in the video and go to subtitles/cc, then "add subtitles/cc". I really appreciate those who do this, as it helps make the lessons accessible to more people.

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