They don't change the existing parts of the language, they just enlarge its body. Imaginary numbers don't invalidate the other rules. In natural languages, if y

They don't change the existing parts of the language, they just enlarge its body. Imaginary numbers don't invalidate the other rules. In natural languages, if you learn the rules down to the last nit-picky detail, you will soon realize that it is no longer valid, sometimes within years, other times within decades.