> because, as xorxes notes, it leads to errors like saying > "loi nanmu weighs 100kg e 1000kg" is true.
I hold that to be true, not false. It's possible to say all sorts of things that look contrary about masses, that being the nature of them.
Do you understand that as meaning "there is some fraction of the mass of all men, such that that very same fraction weighs both 100kg and 1000kg"? Is that fraction at all identifyable?
Of course, straight negations like "loi nanmu na -weighs 1000 kg" are still false.