Comment #3 on issue 2359 by asmeurer: Should Pow(expr, S(1)/2) print as
sqrt(expr)
http://code.google.com/p/sympy/issues/detail?id=2359
Actually, "R(3, 4)" is more characters than "S(3)/4" (count them).
But of course, it's more if you put it in an exponent, because of the extra
parentheses. So +.5 to R, and -1 to giving a second argument to S.
Does (x**p)**1/q always denest into x**(p/q)? I don't remember my
assumptions rules.
How about creating a "root" function that gives the nth root (root(expr, n)
== expr**(S(1)/n))?
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