Report But what does .9999999999… MEAN? in Metaphysics and Epistemology Posted August 1, 2010 All right, Mindy, but your development of "quantity" explicitly leaves out the problem of measurement of the continuum, which is the whole point here. It's true that we can only measure physical objects using rational numbers, but 0.999... = 1 is meant in the sense of real numbers, and so is a concept of method. Anyway, you seem to be bothered by the fact that whatever quantity is denoted by the symbol "0.999..." cannot be represented as a terminating decimal of the form 0.?????. That's true, but has no bearing on the truth of 0.999... = 1. If you don't want to accept the existence of numerical expressions beyond terminating decimals I suppose that's your business, but don't go around claiming that it can't be done. I handle such objects all the time in a way that ties right back to reality, in the way that has already been presented in this thread. Anyway, I think we've both made our points, so I'm gonna bow out-- thanks for the discussion.