orientability
A Klein bottle can't hold any liquid because it doesn't have an inside. How do you construct this strange thing and why would you want to?
In the first of a new series 'Imaging Maths', Plus takes an illustrated tour of an extraordinary geometric construction: the Klein bottle.
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Want facts and want them fast? Our Maths in a minute series explores key mathematical concepts in just a few words.
The COVID-19 pandemic has amplified the differences between us. Understanding these inequalities is crucial for this and future pandemics.
Now it's the turn of mathematicians to help to improve the communities of the future.
There have been accusations that the modelling projecting the course of the pandemic was too pessimistic. Are they justified?
We all know what turbulence is, but nobody understands it.
Find out about the beautifully intuitive concept that lies at the heart of calculus.