How An Infinite Hotel Ran Out Of Room

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Published 2021-05-10
If there's a hotel with infinite rooms, could it ever be completely full? Could you run out of space to put everyone? The surprising answer is yes -- this is important to know if you're the manager of the Hilbert Hotel.

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References: Ewald, W., & Sieg, W. (2013). David Hilbert's Lectures on the Foundations of Arithmetic and Logic 1917-1933. Springer Berlin Heidelberg. -- ve42.co/Ewald2013

Gamow, G. (1988). One, two, three--infinity: facts and speculations of science. Courier Corporation. -- ve42.co/Gamow1947

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Special thanks to Patreon supporters: Paul Peijzel, Crated Comments, Anna, Mac Malkawi, Michael Schneider, Oleksii Leonov, Jim Osmun, Tyson McDowell, Ludovic Robillard, jim buckmaster, fanime96, Juan Benet, Ruslan Khroma, Robert Blum, Richard Sundvall, Lee Redden, Vincent, Marinus Kuivenhoven, Alfred Wallace, Arjun Chakroborty, Joar Wandborg, Clayton Greenwell, Pindex, Michael Krugman, Cy 'kkm' K'Nelson, Sam Lutfi, Ron Neal

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Animation by JD Pounds and Jonny Hyman
Thumbnail by Ivy Tello
Music by Jonny Hyman and from Epidemic Sound and E's Jammy Jams (Hotel Lavish - Radio Nights, Steps in Time - Golden Age Radio, What Now - Golden Age Radio, Book Bag - E's Jammy Jams, Arabian Sand - E's Jammy Jams, Firefly in a Fairytale - Gareth Coker)
Written By Derek Muller and Alex Kontorovich
Sound Design by Jonny Hyman

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All Comments (21)
  • @Idek294
    Dude, the people staying in that hotel must be pissed having to move so much.
  • @ibizenco
    Hotel manager: "You want a room, sir? No problem. The last room at the end of the hall is still free. Just follow the hall and you'll get there. Eventually."
  • @LuioTap
    "Hey,you need to move to the room 748374896246326423874,and the elevator is broken,sorry for it" "....."
  • @jellllllly
    I like how he explained it in such an understandable way to shield my brain from realizing I actually understood nothing.
  • "Imagine there's a hotel with infinite rooms..." Already lost me, buddy.
  • "Hey honey how was work?" "Rough day. An infinite number of infinite buses showed up."
  • @user-oe1ox8eg3p
    "Do you know my friend?" "Who?" "Abababababababababababababababababababababababa...."
  • "All right, everyone, move to the room number that's twice your current room number." Guy at Room One Billion: "Ugh, fine..."
  • @TheWanderer_1
    “An infinite number of infinite busses.” - “Dear god.” “But now a big bus pulls up” - “No.”
  • You think THAT'S bad? Let's assume 1% of the population is disagreeable. That means an infinite number of customers will refuse to leave their room and move to another one.
  • @user-rr3ce3ls2o
    I booked 1 night in the Hilbert Hotel and it was horrible! It was 10pm at night when I arrived and the receptionist asked me to move to room 13739 and the elevator is still broken as many comments mentioned here, plus a 30003 seater bus pulled up and the receptionist asked me to shift to room 43742 and I had no time to collect my stuff I brought to the hotel with me. The other guy who took my original room who was on the bus also took my stuff, INCLUDING my laptop. Even when I was sleeping, I was asked to SHIFT to double of my room number and was like "F********** this" and completely checked out at 1 in the morning instead of 12 noon which I promised to the receptionist. Bad hotel, don't go here. Would give 0 stars if there was even an option.
  • @RxktPlayz
    People in the hotel “I literally just finished unpacking stop moving us to another room.”
  • @chiraggowda4928
    Finally, a job where I can use my PHD in math. A hotel manager.
  • @SwapravaNath
    This is the best explanation of countable vs uncountable I have heard so far.
  • @Waterwolf221
    Imagine disturbing an infinite amount of clients just to fit one more person in the hotel
  • @mcmona4171
    "I love you " "I love you more" "I love you times infinity!" Me: pulls out spreadsheet.
  • @antimatterj6005
    My CS professor wasn’t able to explain the difference between countable and uncountable Infinity as well as you just had. Thank you for helping me understand that lesson 4 years later lol.
  • @RyanShabbir
    Bro F’d my brain up and thought I wouldn’t notice💀💀
  • @colinginn7025
    I was going to make a joke about infinity, but I'll never hear the end of it.