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Puzzles

It's a long way to the top

In how many ways can you make it up the stairs?

Making a very special number out of primes.

Cross Katastrophion 1: Platinum

Cross Pandemonion 1: Gold

Cross Hypernion 1: Platinum

Katastrophion 3: Platinum

Hypernion 2: Gold

Cross HyperLogikion 1

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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.

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.
Maths in a minute: The axioms of probability theory

Take a quick trip to the foundations of probability theory.
The real numbers and Cauchy sequences

We take the real numbers for granted, but what are they really?
Arithmetic billiards

Need to find the least common multiple or greatest common divisor of two numbers? A billiard table of the right proportions holds the answers!
The two envelopes problem solved

Here's a resolution for one of probability theory's most famous paradoxes.

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