compute probabilities are hard to assess otherwise that's really what's going on here under the hood it's that we don't have direct access to the distribution we want we've access to it sometimes the reverse distribution we can use to get what we want under the markets assumption this recursive Bayesian updating can be done very efficiently and Bayes photos are kind of the common pricing tool for estimating the state of dynamic systems here's a simple example imagine your robots supposed to localize has four