ends up being solvent called likelihood and evidence is yeah that's just Y is what you measure to is a probability of getting that evidence this we just talked about when you do these calculations often you effectively algorithmically you compute it for all X's you compute that top part in the fraction and after you've done that you know it has to be rescaling you just compute the rescaling and multiply with that in the paralytic robotics book notation it's a little bit funny that sometimes they use the ADA as the thing