|Q-Z| is countably infinite, but |Q| = |Z|. There are countably infinite rationa...

		verma7 on June 9, 2020 \| parent \| context \| favorite \| on: Bill Thurston's answer to “What's a mathematician ... \|Q-Z\| is countably infinite, but \|Q\| = \|Z\|. There are countably infinite rational numbers that are not counting numbers, yet there are exactly as many rational numbers as counting numbers.