How big is infinity? - Dennis Wildfogel

source: TED-Ed     2012年8月6日
View full lesson: http://ed.ted.com/lessons/how-big-is-...
Using the fundamentals of set theory, explore the mind-bending concept of the "infinity of infinities" -- and how it led mathematicians to conclude that math itself contains unanswerable questions.
Lesson by Dennis Wildfogel, animation by Augenblick Studios.