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At u@:v  _ _ _

@: is equivalent to @ except that ranks are infinite.
 

For example:
   x=: 1 2 3 4
   y=: 7 5 3 2
   x */ @: + y                 Applies product over sums to the entire lists
2016
       
   x */ @ + y                  Applies product over sums to each item of the list
8 7 6 6
     
   + b. 0
0 0 0

   */ @: + b. 0
_ _ _

   */ @ + b. 0
0 0 0



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