array9

I guess it must be because they are not counting everthing.  If there is anything, however small, over the whole space missing, then you will have infinities.

One way of thinking about it is that the sum over the whole space of any meaningful thing should be zero.  So for instance the total energy in the universe should be formulated to be always zero.  The total momentum must be zero.  Total angular momentum must be zero.  Total volume. Eric

Now what this implies is that we are either missing something, or counting the wrong thing.

Martin