image What is difficult to do in the present world is accomplished by projecting it into another world, doing it there, and then returning to it.

Rotation is unwieldy in the Cartesian coordinate system, so it is converted to the polar coordinate system, rotated there, and then returned to the original coordinate system.

Fourier analysis can transform time series data (data in the time domain) into the frequency domain. For example, convolutional integration is simply multiplication in the frequency domain.


This page is auto-translated from /nishio/別の世界で解決する using DeepL. If you looks something interesting but the auto-translated English is not good enough to understand it, feel free to let me know at @nishio_en. I’m very happy to spread my thought to non-Japanese readers.