yeah but +1 is interesting if applied to the argument, not the function. TREE(3+1) instead of TREE(3)+1. In essence, +1 is all you have to work with if you want

yeah but +1 is interesting if applied to the argument, not the function. TREE(3+1) instead of TREE(3)+1. In essence, +1 is all you have to work with if you want to stay in a sound logic, the question is just where to apply it. The logical conclusion would be op[TREE+1](3) in array notation.