Hilbert's Infinite Hotel

Step 4: What Cantor Saw

David Hilbert's hotel has infinitely many rooms and no vacancies, yet it can always take more guests. Check in a new guest, unload an infinite bus, and find the one bus that will never fit.

1. A Full Hotel
2. The Infinite Bus
3. Infinitely Many Buses
4. What Cantor Saw
5. The Bus That Doesn't Fit
6. Bigger Infinities