Enter Details

Comment on stories, receive email newsletters & alerts.

This is your permanent identity for Business Insider Australia
Your email must be valid for account activation
Minimum of 8 standard keyboard characters


Email newsletters but will contain a brief summary of our top stories and news alerts.

Forgotten Password

Enter Details

Back to log in

The 12 most controversial facts in mathematics

Controversial maths slideshow

Mathematics has little surprises that are designed to test and push your mental limits.

The following 12 simple maths problems prove outstandingly controversial among students of maths, but are nonetheless facts.

They’re paradoxes and idiosyncrasies of probability.  And they’re guaranteed to start an argument or two. 

If you’re looking for a mathematical way to impress your friends and beguile your enemies, here’s a good place to start. 

Please send all attempts at counter-proofs as well as any abuse or beration to either [email protected] or @WaltHickey

NOW WATCH: Money & Markets videos

Want to read a more in-depth view on the trends influencing Australian business and the global economy? BI / Research is designed to help executives and industry leaders understand the major challenges and opportunities for industry, technology, strategy and the economy in the future. Sign up for free at