Imagine there's only math: physics is nothing more than mathematics, we are self-aware mathematical substructures, and our physical universe is nothing more than a mathematical structure "seen from the inside". If that's the case, I will argue that it implies the existence of the Maxiverse, the largest imaginable multiverse, where every possible conscious observation is guaranteed to happen. I will attempt to explain why, of all the worlds in the infinite Maxiverse, we happen to live in one that can be understood by physical laws simple enough to be discovered (or, at least, approximated well enough for predictive and technological purposes). I will consider the question of personal identity in the context of a Maxiverse that contains an infinite number of exact clones of myself, and whether I should expect my future subjective experience to be unbounded. I will also consider the question of whether the Maxiverse hypothesis makes predictions that can be put to the test.
Marc Séguin