Leave the Class Path in the Rearview Mirror

Notes on discrete-time Fourier series and transform

The following are my notes on discrete-time Fourier series (DTFS), as well as the discrete-time Fourier transform (DTFT). These topics serve as an important theoretical underpinning to the digital processing of signals by computers using the DFT (which will be covered in a future post). For discrete-time signals, we use …

How I Vibed a Proof of Conway’s Conjecture

You can just prove things, apparently.

DADan Abramov·September 18, 2026Engineering

Reproducing, disclosing, and fixing the libheif vulnerability with Hacktron and the maintainers