I know they didn't teach you the exact solution to all this in mine school.

If we can get within 1 percent of an exact solution, that's good enough.'

Presently, it seems that no exact solutions for this specific type are known.

Exact solutions of Einstein's field equations are very difficult to find.

Exact solutions are not possible, and numerical methods must be used instead.

Nevertheless, a number of exact solutions are known, although only a few have direct physical applications.

Since then, many other exact solutions have been found.

The exact solution in three dimensions is only known for a special "frozen" state.

Getting an exact solution is impractical though, because it requires a long time, or many resources.

However there is no exact solution of the Hubbard model in more than one dimension.