latest thing that happened latest thing that happened in that progression is the measurement ZT how do you incorporate a measurement Bayes rule so ignore everything but XD and ZT what we do p XD given ZT we'd say Bayes rule its ZT given XT times XT okay that's exactly what we're doing we're going to apply Bayes rule and then some normalization right but remember there's also that other stuff and we'll just carry it around everywhere we know that we can carry things around everywhere as long as we do it consistently so it's