That mathematical formula in full.
Here is the article from The Times about Darren Crowdy - this is in response to "racheinderbys" post in Tuesday's Glass Box.
"Didn't hear all of the programme, but loved that you actually had a mathematician on and had a serious attempt get to grips with his work. I missed his name - can you give it (or better still a reference for his paper)? I can't find any reference to it on the BBC News website. FWIW I loved Billy Bragg too."
And here is Darren's formula. If you have any questions, please just ask.