Quoth Bulat Ziganshin, nevermore,
are you learned to write things in this way? in *my* school, we have studied
f=(a*b+d)*2
Also there's the issue of variable substitution. It gets taught very early on when algebra is introduced (at least in UK): f = x + 3y and y = sqrt(4 + n) => f = x + 3(sqrt(4 + n)) (I can't think of a real example at the moment, sorry!) Unless the calculation for y is extremely arduous you're always taught to just throw them all together. This really gets across the "equality by definition" thing that pure FP uses. There's no need to do things in any particular order. This is pretty close to how 'straight' function application works; I don't think we ever did anything like higher order functions in high-school algebra. Maybe that's the next step --- lambda calculus at age ten and up! :) Cheers, Dougal.