All mathematicians can take part, by which we mean mathematicians of any background. We aim to have a good balance of pure and applied mathematics, statistics, and probability.
This is open to all academic staff and researchers, research assistants, and postgraduate students working within mathematical sciences.
You might wonder if your expertise would have been useful for any of these problems. The fact is that the skills required to address these problems are much broader than first comes to mind. It is the interaction between mathematicians with a wide range of expertise and experience that allows one to tackle these problems in such a short time.