lib/dydx/algebra/operator/parts/interface.rb in dydx-0.0.4 vs lib/dydx/algebra/operator/parts/interface.rb in dydx-0.0.5

@@ -1,13 +1,21 @@
 module Dydx
   module Algebra
     module Operator
       module Parts
         module Interface
-          %w(+ - * / ^).each do |operator|
+          %w(+ - * / ^).map(&:to_sym).each do |operator|
             define_method(operator) do |x|
               x = ::Set::Num.new(x) if x.is_a?(Fixnum)
-              super(x)
+              case operator
+              when :-
+                self + inverse(x, :+)
+              when :/
+                raise ZeroDivisionError if x.is_0?
+                self * inverse(x, :*)
+              else
+                super(x)
+              end
             end
           end
         end
       end
     end