We do not believe that it functions according to predictible rules, we simply look for rules and we have infact found some. That is why we can design a scyscraper and know that it won't topple without trying it out first.
Sorry but there is no math government that can enforce rules, and the order of operations isn't intrinsic either. It is just something people agreed upon volununtarily, aka a convention
Yes but the name sucks. Universe means all encompassing, including the structure you're talking about. It's semantically impossible for multiple universes to exist
Uhhm guyss shes just taking us around the galaxy