The world we experience is the objective reality and the infinite three-dimensional space represents only subjective reality. Prof. Dr. Szalay István mathematical world model is based on just three psysichal facts: the Big Bang, supremal velocity, which cannot be reached and the rapid extension of the Universe. In this book the three-dimensional Euclidean space is compressed into an open cube called s-Universe. On the other hand, by the explosion of the three-dimensional space we create the Multiverse. A certain s parameter plays a mysterious role because it is not specified what it depends on. According to his model we live in a finite s-Universe. The s-Universe is contained in the infinite three-dimensional space. The rapid extension of the Universe gives the hypotesis of the Second Big Bang which is a novelty among the hypoteses, for example the Pulsing Universe or Big Crash. One may ask, what is left of the Universe after Occam's resor? The answer: points and sets of points can be described mathematically.