Ramsey number

Too big to write but not too big for Graham

Meet the number that's bigger than the observable Universe!

Sometimes a mathematical object can be so big that, however disorderly we make the object, areas of order are bound to emerge. Imre Leader looks at the colourful world of Ramsey Theory.

Maths in a minute

Want facts and want them fast? Our Maths in a minute series explores key mathematical concepts in just a few words.

Pandemics and psychology

Can you capture people's behaviour in epidemiological models?
How to work out doubling time

The doubling time for the Omicron variant seems to be scarily fast. But how do you calculate it?
Maths in a minute: QALYs

What's a quality adjusted life year, or QALY?
Life on the beach with Markov chains

Markov chains are exceptionally useful tools for calculating probabilities, and they might increase your chance of getting to the beach!
Why the generation time of COVID-19 is important

To work out the famous R number you need to know the time between infections.

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