lib/dydx/algebra/inverse.rb in dydx-0.1.28 vs lib/dydx/algebra/inverse.rb in dydx-0.1.29

@@ -7,16 +7,13 @@
       def initialize(x, operator)
         @x, @operator = x, operator
       end
 
       def to_s
-        # sym = {'*'=>'/', '+'=>'-'}[operator.to_s]
         case operator
-        when :+
-          "( - #{x} )"
-        when :*
-          "( 1 / #{x} )"
+        when :+ then "( - #{x} )"
+        when :* then "( 1 / #{x} )"
         end
       end
 
       def differentiate(sym=:x)
         case operator
@@ -25,12 +22,8 @@
         when :*
           inverse(x.differentiate(sym) * inverse(x ^ 2, :*), :+)
         end
       end
       alias_method :d, :differentiate
-
-      def ==(x)
-        to_s == x.to_s
-      end
     end
   end
-end
\ No newline at end of file
+end