From: C Erler <erlercw@...>
Date: 2005-09-17T16:46:46+09:00
Subject: 5**(-1/2) gives incorrect results under mathn.

With ruby 1.8.1,

require 'mathn'

p 5**(1/2)
p 5**0.5
p 5**(-1/2)
p 5**-0.5

2.23606797749979
2.23606797749979
2.23606797749979
0.447213595499958