## Travelling salesman problem

Quantum particles that are both light and matter help solve infamous NP hard problems.

*Travelling Salesman* is an unusual movie: despite almost every character being a mathematician there's not a mad person in sight. Moreover, the plot centres on one of the greatest unsolved problems in mathematics. We were lucky enough to speak to the writer/director Tim Lanzone about creating drama from mathematics.

The *Travelling Salesman* movie is coming to the UK! Get your tickets here and find out about the P vs NP problem.

This week the International Symposium on Mathematical Programming (ISMP) took place in Berlin. It's the world congress of mathematical optimisation, which drew over 2,000 scientists and members of industry to Germany's capital. But what exactly were they talking about?