Imaging maths - Inside the Klein bottle

September 2003

Mirror image and orientability

If you move this face around the Möbius band, it returns as its mirror image (and upside-down). This means that the Möbius band is non-orientable.

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.

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Bitcoin is a digital currency that isn't regulated by any kind of central authority. The structure which allows this decentralisation is called blockchain. But how, and how well, does it work?
Maths and politics

Mathematicians like to think that their field transcends politics, but as this brief history of the International Congress of Mathematicians shows, international mathematics has always been coloured by world events.
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