Nice catch, Patrick. Thanks for reporting it. One comment you made caught my attention:
> I came of with the following explicit definition though I could not > quite see why mp2 is equivalent since I had to change the rank of > the insert. > > +/"_1(a *"1 _ b) > 5 1 > 4 2 Instead of "change the rank of the insert" I recommend "change the rank of the summation" because the rank specification applies to the whole verb to its left. The production of verbs is resolved left-to-right, as you likely already know. To parenthesize this example for emphasis: (((+)/)"_1)noun Tracy ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
