Add new comment

Permalink Submitted by Anonymous on August 14, 2011

Could you please tell me what t stands for in equation (9)?
I'm stuck ! Thanks.

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.

Careful with your Christmas b(a)ubbles

Modelling shows that your choice of how many households you bubble with this Christmas can make a real difference to the spread COVID-19.
The maths of COVID-19

All our COVID-19 related coverage at a glance.
Pop Math is live!

If you're interested in maths events for a general audience, then try the new Pop Math international events calendar!
The COVID-19 vaccines: Your questions answered

Are they safe? Are they effective? Will they stop the pandemic? Find out with our FAQ informed by experts.
Some lovely proofs by picture

Don't like trigonometry? Don't worry, here are three beautiful proofs of a well-known result that make do without it.