diff --git a/lib/mathn.rb b/lib/mathn.rb
index dfbc9b2..7aa1e1c 100644
--- a/lib/mathn.rb
+++ b/lib/mathn.rb
@@ -77,89 +77,6 @@ class Bignum
 end
 
 ##
-# When mathn is required Rational is changed to simplify the use of Rational
-# operations.
-#
-# Normal behaviour:
-#
-#   Rational.new!(1,3) ** 2 # => Rational(1, 9)
-#   (1 / 3) ** 2            # => 0
-#
-# require 'mathn' behaviour:
-#
-#   (1 / 3) ** 2            # => 1/9
-
-class Rational
-  remove_method :**
-
-  ##
-  # Exponentiate by +other+
-  #
-  #   (1/3) ** 2 # => 1/9
-
-  def ** (other)
-    if other.kind_of?(Rational)
-      other2 = other
-      if self < 0
-        return Complex(self, 0.0) ** other
-      elsif other == 0
-        return Rational(1,1)
-      elsif self == 0
-        return Rational(0,1)
-      elsif self == 1
-        return Rational(1,1)
-      end
-
-      npd = numerator.prime_division
-      dpd = denominator.prime_division
-      if other < 0
-        other = -other
-        npd, dpd = dpd, npd
-      end
-
-      for elm in npd
-        elm[1] = elm[1] * other
-        if !elm[1].kind_of?(Integer) and elm[1].denominator != 1
-          return Float(self) ** other2
-        end
-        elm[1] = elm[1].to_i
-      end
-
-      for elm in dpd
-        elm[1] = elm[1] * other
-        if !elm[1].kind_of?(Integer) and elm[1].denominator != 1
-          return Float(self) ** other2
-        end
-        elm[1] = elm[1].to_i
-      end
-
-      num = Integer.from_prime_division(npd)
-      den = Integer.from_prime_division(dpd)
-
-      Rational(num,den)
-
-    elsif other.kind_of?(Integer)
-      if other > 0
-        num = numerator ** other
-        den = denominator ** other
-      elsif other < 0
-        num = denominator ** -other
-        den = numerator ** -other
-      elsif other == 0
-        num = 1
-        den = 1
-      end
-      Rational(num, den)
-    elsif other.kind_of?(Float)
-      Float(self) ** other
-    else
-      x , y = other.coerce(self)
-      x ** y
-    end
-  end
-end
-
-##
 # When mathn is required, the Math module changes as follows:
 #
 # Standard Math module behaviour: