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

@@ -7,20 +7,20 @@
         def initialize(n)
           @n = n
         end
 
         def differentiate(sym=:x)
-          _(0)
+          e0
         end
         alias_method :d, :differentiate
 
         def to_s
           @n.to_s
         end
 
         def ==(x)
-          x.is_a?(Num) && n == x.n
+          to_s == x.to_s
         end
       end
     end
   end
-end
\ No newline at end of file
+end