Hi again, everybody. I have been mulling over lately some important assumptions we made when thinking, but suddenly I realize I cannot justify them all. Here is one of them: Supposing there exists parallel universes, would their physics laws obey our logical rules? Or rephrasing it: Could exist something illogical in this one or another universe? Is that possible? Or another rephrase: Are mathematics nonsensical in other universes? I feel much more comfortable thinking that the Universe (including parallel universes) always behaves respecting the rules of logic (and thus mathematical rules), but I cannot find any reason to justify that. So, can I conclude this assumption is just kind of a religious act of faith, or a personal preference? Logic is an entire philosophical branch. Is it right to say that it is based on an unjustifiable hypothesis? We suppose logical rules are universal, but why? Can we be sure about that? Based upon what? Thanks for any hints about it.