Comment by nilkn

The answer to that depends on exactly how one defines writing. If by writing we mean full alphabets, etc., then no, but that is not the critical function that the word played in what I wrote. If by writing we mean encoding structured mathematical information physically (which today consists not just of written words/sentences, but also non-linguistic equations and computer programs) so that it can be accurately and unambiguously digested (and modified or corrected by) others, then yes: as far as we know there was no mathematical knowledge outside of spoken and bodily counting or the most basic visual symmetries of objects like stones or sticks.