orientability

Mathematicians solve the famous loop's mystery

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.

Who's watching: The limits of observation

Physics is all about observation, but how much can we actually see?
The real numbers and Cauchy sequences

We take the real numbers for granted, but what are they really?
Who's watching: Can maths exist if you can't see it?

We explore non-constructive proofs and what happens if you try and avoid them.
Citizen science: Schumann resonances

Resonant electromagnetic waves, created by lightning flashes, circle the Earth. Wim Hordijk explores the maths and shows how you can keep track with these phenomena.
Something from nothing?

If you can prove that a statement can't possibly be false, does this mean it's true?