abundant.rb in numb-0.63.0

- old
+ new

@@ -11,10 +11,10 @@
   #     100.abundant?  #=> true
   #     345.abundant?  #=> false
   #
   def abundant?
     return false unless self > 0
-    sum_of_divisors > (2 * self)
+    σ > (2 * self)
   end
 
   alias :excessive? :abundant?
 end