to be able to assign probabilities to the next symbol in your sequence if you can do that you can use arithmetic coding but even that tend to require that there's a relatively small number of symbol values if your symbol can take on infinitely many values it's not really clear how you doing arithmetic coding so when it is fire 11 1 X continuous but that's actually quite fixable we'll look at that on the next slide and then the X is high dimensional and that's the main challenge we'll be looking at the observation here is down