Any one who considers arithmetical methods of producing random digits is, of course, in a state of sin.
John von NeumannThe sciences do not try to explain, they hardly even try to interpret, they mainly make models. By a model is meant a mathematical construct which, with the addition of certain verbal interpretations, describes observed phenomena. The justification of such a mathematical construct is solely and precisely that it is expected to work-that is, correctly to describe phenomena from a reasonably wide area.
John von NeumannProblems are often stated in vague terms... because it is quite uncertain what the problems really are.
John von Neumann