Discrete convolutions, from probability to image processing and FFTs. Video on the continuous case: https://youtu.be/IaSGqQa5O-M Help fund future projects: https://www.patreon.com/3blue1brown Special thanks to these supporters: https://3b1b.co/lessons/convolutions#thanks An equally valuable form of support is to simply share the videos. Other videos I referenced Live lecture on image convolution