Ed Keefe's article on SIGMA in the Jan/Feb issue of the PTP is quite helpful in further understanding of L() function. I note that sometimes you use (:) as a delimiter and then sometimes a (,). I tried out your examples with the : and they seemed to work okay. But is there something significant about using one (:) or the other (,)?
Mick Luce
Portland, OR, USA
[The use of ":" in the L( :) function is a holdover from the HP 19IIb. I suppose HP left that in Solver to make it backward compatible with the calculator. I was surprised when ":" worked. I like it better than "," since commas are hard to keep track of, but either one will work -- Ed.]