I see, that is a nice perspective.

And that's what I figured, the poison got in. And he says in the beginning when he goes to talk to Elliot something like, "The significance of being a math teacher is knowing math equations to comfort myself with. You know, people are comforted by math and percentages." thats not an exact quote but i remember he said somethingl ike that, just maybe i forgot a few words or something, and then later he said something else about equations. We saw Julian for only a short time in the movie, so there wasnt too much to support that, except him in the car with the equation. but maybe he shouldve said, at one point, the percentage of them surviving or something, or maybe when he departed from his daughter, he could've said a math equation to support the fact that math was an important part of his life.