[go-nuts] math/big pow() and floor() help

Hi,

I find myself trying to covert some Python code to Go which uses
arbitrary large numbers.
The original Python code takes the square root and floors the result of
one of these numbers.

But, looking at Go's math/big package, I can't work out how square root
one of these numbers. There doesn't, at first glance, seem to be an
arbitrary "pow" function. Likewise the floor function.

As this isn't my usual area, I feel don't understanding something
fundamental. Does anyone have any pointers, or packages, or example code
that can point me in the right direction?

Thanks

Owen