How to prove there is no Universe

Years ago, when I first read Paul Halmos’ seminal Naive Set Theory, I was blown away by how easy it was to prove that there is no universe. In fact, not even three sections in, he drops this italicized bombshell: $$nothing\text{ }contains\text{ }everything$$ or, “more spectacularly,” he continues $$there\text{ }is\text{ }no\text{ }universe$$ Luckily, we only … [Read more…]