want to know the posterior you're giving future evidence okay yeah so a question is about the smoother being useful I'm gonna defer the answer to that till the second half of a lecture because we're kind of building up to where we're going to use it and so let's see if it's still that question after lecture but it's a very valid question just a little bit of patience so what we've covered so far is filtering and smoothing which returns at distribution for the marginal what is the distribution for State at time T