Riemann's paradox: pi = infinity minus infinity
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With the help of a very famous mathematician, the Mathologer sets out to show how you can subtract infinity from infinity in a legit way to get exactly pi.
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TED-Ed Selects are exceptional, user-created lessons that are carefully selected by volunteer teachers and TED-Ed staff.
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- Lesson Creator Cynthia Silva
- Video Source Mathologer
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Additional references
Riemann's Rearrangement Theorem - University of Washington
143-Year-Old Problem Still Has Mathematicians Guessing - The New York Times
The Infinite Hotel Paradox
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Additional references
Riemann's Rearrangement Theorem - University of Washington
143-Year-Old Problem Still Has Mathematicians Guessing - The New York Times
Whether math is a subject that makes you jump for joy or squirm in fear, it exists in almost all aspects of our lives. By watching this video, you continue to flex your brain and become better prepared for the future.

Cynthia Silva
Lesson Creator
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About TED-Ed Selects
TED-Ed Selects are exceptional, user-created lessons that are carefully selected by volunteer teachers and TED-Ed staff.
Meet The Creators
- Lesson Creator Cynthia Silva
- Video Source Mathologer