Two mathematicians have proved that a straightforward question—how hard is it to untie a knot?—has a complicated answer.

A new collection of research papers examines how humans conceptualize numbers and the numeral systems we’ve build around them ...

Marijn Heule turns mathematical statements into something like Sudoku puzzles, then has computers go to work on them. His ...

Operating massive reverse proxy fleets reveals hard lessons: optimizations that work on smaller systems fail at scale; mundane oversights like missing commas cause major outages; and abstractions ...