If all sentient beings in the universe disappeared, there would remain a sense in which mathematical objects and theorems would continue to exist even though there would be no one around to write or talk about them. Huge prime numbers would continue to be prime, even if no one had proved them prime.

When You Were a Tadpole and I Was a Fish: And Other Speculations About This and That (ed. Macmillan, 2009) - ISBN: 9781429935548