Every week a new challenging problem about Bengt and his friends.
2008-12-24
Christmas Equation
It's Christmas Eve, and Bengt is celebrating by dancing around a new equation. It looks like this: √(x²+y²)=5-z+f(z)-√(5z) where f the floor function, that is, f(z) is z rounded down to the nearest integer. What is this the equation for?