Making Light: Open thread 135 ::: February 16, 2010, 12:14 PM Diatryma #697 and David Harmon #699: For the OR operation, I'd suggest MAX, rather than "+", if it's available. Incidentally, if Excel has mathematical taste, you could use GCD for OR and LCM for AND (remembering that for purposes of divisibility, 0 is greater than 1 (or any other positive integer)). But I wouldn't trust it to work, it's just fun to consider. Lattice enjoy it.