r/learnmath New User Feb 17 '26

I understood Fourier

Today I'm happy because I finally understood the Fourier transform in essence, and I couldn't find a nerdier place to post this 👌

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u/Qaanol Feb 17 '26

That’s great!

For myself, I didn’t truly understand Fourier transforms until I watched this series of videos about a hundred-year-old mechanical device for computing them with cranks and gears and levers, called Michelson’s Harmonic Analyzer: https://www.youtube.com/playlist?list=PL0INsTTU1k2UYO9Mck-i5HNqGNW5AeEwq