The most intuitive, easy-to-follow explanation of Fourier transforms I've ever come across

March 25, 2014

It's here. I found the link when I happened across a discussion of the topic in the Math Stack Exchange. I wish I had seen this way back when I was implementing FFTs in my computer music class in college.  It would have saved me some headaches.

Bonus interesting math thing: The Genuine Sieve of Eratosthenes, a paper by Melissa E. O’Neill. 

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