img3 - Chalkdust

Sam is a maths student at Durham University where he hosts
Chalkboard Ultra podcast and spends too much time thinking about spinors. Outside of maths, Sam runs one of the university’s jazz bands.

Easy to state, hard to prove: The Collatz conjecture
90 years later, we're still unable to prove this surprisingly simple statement
The big argument: What’s the best way to end a proof?
QED or $\square$?
Top Ten: Matrices
The definitive chart of the best matrices
Review: Power in numbers — the rebel women of mathematics
Celebrate International Women's day by reading about rebel women in mathematics!
An irrational problem
Investigating the power of thinking rationally
Carnival of mathematics 152
We round up some of the last month's top mathematical posts from around the internet