@infsup: nthroot (X, N) ¶Compute the real n-th root of X.
Accuracy: The result is a valid enclosure. The result is a tight enclosure for n ≥ -2. The result also is a tight enclosure if the reciprocal of n can be computed exactly in double-precision.
See also: @@infsup/pown, @@infsup/pownrev, @@infsup/realsqrt, @@infsup/cbrt.
Package: interval