exact details of it but every possible state is a point in that rectangle and then a is a property of the state of the world that holds true for all the ones that line that blue circle the bees have property of the state that holds true for all the states of the world in the yellow circle and then a intersection B is a property of the world that holds true for all the points that are in the intersection and so you can think of a and B just as properties or descriptions of you know abstractions of the world of