lib/dydx/algebra/set/fixnum.rb in dydx-0.0.6 vs lib/dydx/algebra/set/fixnum.rb in dydx-0.0.7

@@ -3,10 +3,10 @@
     module Set
       Fixnum.class_eval do
         include Helper
 
         def differentiate(sym=:x)
-          _(0)
+          e0
         end
         alias_method :d, :differentiate
       end
     end
   end