1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Inside out universe

  1. May 7, 2009 #1


    User Avatar
    Gold Member

    In George Gamow's book "One Two Three Infinity" he explains on page 56 how to turn a "double apple" with a free surface into a doughnut:
    He then (page 58) goes on to explain how the reverse process can be used to make an "inverse universe" where a human is somehow tured inside out.
    I'm pretty sure that I understand how the double apple is changed to a doughnut but I don't understand how the reverse process make an inverse universe. It seems as if we just have to change the material of the doughnut itself and not the surrounding space.
    Last edited: May 8, 2009
  2. jcsd
  3. May 7, 2009 #2
    Have a look at the surface he demarcates "FREE". What is it bounding in each step? :)
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook