You're right of course. I was thinking about associtivity, not seeing what's really written. Sorry. I didn't expect discussing commutativity in the context (it's the non-associativity that doesn't allow all the "automatic" optimizations expected by some) where the formula in the same sentence is with three elements and the different order of computation. Which doesn't change the fact that I've made an error.
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You're right of course. I was thinking about associtivity, not seeing what's really written. Sorry. I didn't expect discussing commutativity in the context (it's the non-associativity that doesn't allow all the "automatic" optimizations expected by some) where the formula in the same sentence is with three elements and the different order of computation. Which doesn't change the fact that I've made an error.