Why is the problem called the ten martini problem? Sounds like an interesting name for people who drink.



The ten martini problem - reason for name
The name was coined by Barry Simon in this 1982 [article](http://www.math.caltech.edu/SimonPapers/R26.pdf) (page 487):



> 
> **The Ten Martini Problem:** *The almost Mathieu operator has a Cantor spectrum.*
> 
> 
> The name comes from the fact that Mark Kac\* has offered ten
>  martinis to anyone who solves it. [...] Actually, Kac said "has all
>  its gaps there", so perhaps one should solve instead:
> 
> 
> **The Ten Martini Problem:** (Strong Form, or should it be Dry Form)...
> 
> 
> [\*] Marc Kac, public communication at 1981 AMS Annual Meeting.
> 
> 
> 


