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3Blue1Brown explanation of eigenvectors and eigenvalues is very insightful and intuitive [1]. One of my favorite videos from his channel is "Who cares about topology? (Inscribed rectangle problem)" [2]. They way a Torus and Möbius Strip come up as solution to the problem is so elegant.

[1]: https://www.youtube.com/watch?v=PFDu9oVAE-g&list=PLZHQObOWTQ...

[2]: https://www.youtube.com/watch?v=AmgkSdhK4K8

There's a new topology video out! As cool as the first one!

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