2011-01-26, 02:51 AM
Yes. f(0) would imply that in this diagram:
![[Image: imgc103.gif]](http://img692.imageshack.us/img692/2986/imgc103.gif)
the pairs of diagonal spheres would be touching each other, which would imply that they intersect the adjacent spheres.
Otherwise, I think the formula is valid.
![[Image: imgc103.gif]](http://img692.imageshack.us/img692/2986/imgc103.gif)
the pairs of diagonal spheres would be touching each other, which would imply that they intersect the adjacent spheres.
Otherwise, I think the formula is valid.

