Paul Halmos in How to Write Mathematics says: “A good attitude to the preparation of written mathematical exposition is to pretend that it is spoken. Pretend th

Paul Halmos in How to Write Mathematics says: “A good attitude to the preparation of written mathematical exposition is to pretend that it is spoken. Pretend that you are explaining the subject to a friend on a long walk in the woods, with no paper available; fall back on symbolism only when it is really necessary.”