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

@@ -4,37 +4,23 @@
       module Parts
         module General
           def +(x)
             if x.is_0?
               self
+            elsif inverse?(x, :+)
+              e0
             else
               super(x)
             end
           end
 
-          def -(x)
-            if x.is_0?
-              self
-            else
-              super(x)
-            end
-          end
-
           def *(x)
             if x.is_0?
               x
             elsif x.is_1?
               self
-            else
-              super(x)
-            end
-          end
-
-          def /(x)
-            if x.is_0?
-              raise ZeroDivisionError
-            elsif x.is_1?
-              self
+            elsif inverse?(x, :*)
+              e1
             else
               super(x)
             end
           end