Add new comment

Permalink Submitted by Anonymous on June 7, 2011

No, it is not. Three is a prime, and has a kernel.

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.

The fingernail problem and metallic numbers

A beautiful geometric problem opens the door to the world of metallic numbers.
Universe Unravelled

We're proud to announce the launch of a documentary we have been working on together with the Discovery Channel and the Stephen Hawking Centre for Theoretical Cosmology in Cambridge.
Maths in a minute: Triangular numbers

Triangular numbers: find out what they are and why they are beautiful!
Clearing the air: Making indoor spaces COVID safe

New research shows that ventilation is crucial and that masks are effective.
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.