Max Tegmark, whose talk is summarized in this article if I understand correctly, describes four different types of Multiverse. This article presents three of t

Max Tegmark, whose talk is summarized in this article if I understand correctly, describes four different types of Multiverse. This article presents three of them (levels I, II and III). See Max Tegmark's webpage for more information and links on the subject: http://space.mit.edu/home/tegmark/mathematical.html http://space.mit.edu/home/tegmark/mathematical.html