"In mathematics when the upper value is lower than the "start" value its called the "empty sum" and its value is zero!"
This is exactly what Maple's add command does:
Alan
We could write an "add" function for Mathcad to take a range
BTW, is there an easier way to decide if the range is "reversed" (first value larger than the last)?
Of course the Maple command "add" is much more versatile which cannot achieved in Mathcad per user-defined function.
But we could implement the recursive definition of a sum of expressions quite easily
