threshold-combined

Adding blur and threshold distorts the dual graph.

Sam is a PhD student at Durham Univeristy working on structures in the solar wind. His pastimes include pestering Clare about Linux and making Adam feel old. Seriously, who remembers the 90s?

Chalkdust dissertation prize 2025
Calling all final-year students! This is your opportunity to get your work published as a Chalkdust article.
A symmetric universe
Sam Kay reflects on building a universe
Issue 20
Spirographs, complex triangles and a lot of ants feature in our AW24 issue! Plus all your favourite puzzles & columns.
The big argument: Should we write another issue?
How much barrel is left to scrape?
The big argument: What’s the best way to end a proof?
QED or $\square$?
Puzzles about partitions
Tricks and puzzles that provide an introduction to the world of partitions