This year we are proud to have started our collaboration with the Isaac Newton Institute for Mathematical Sciences (INI). The INI is an international research centre that attracts leading mathematical scientists from all over the world, and our neighbour here on the University of Cambridge's maths campus.

Our job is to bring the wide range of research that is being done at the INI to a general audience. In this year's advent calendar we bring you some of our favourite INI related content, produced over the last twelve months. From Euler's formula to group theory, there's a lot to choose from, all linked to current mathematical research. Enjoy!

Follow Plus on Twitter and Facebook, subscribe to our RSS feed or get Plus delivered straight to your inbox!

This content is part of our collaboration with the Isaac Newton Institute for Mathematical Sciences (INI), an international research centre and our neighbour here on the University of Cambridge's maths campus. INI attracts leading mathematical scientists from all over the world, and is open to all. Visit www.newton.ac.uk to find out more.