Thanks, this was helpful
>
> Sometimes you can use 'assume' to get the behavior you want, however. In
> this case, for example:
>
> sage: var('vgs vt n')
> (vgs, vt, n)
> sage: f = (vgs - vt)^n
> sage: assume(vgs > vt)
> sage: f^(1/n)
> vgs - vt
> sage: forget()
> sage: f^(1/n)
> ((vgs - vt)^n)^(1/n)
> sage:
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