# How big is infinity?

- Institution: TED
- Department: TED-Ed
- Speaker: Dennis Wildfogel
- Year: 2012
- Level: For everyone
- Language: English
- Subjects: Mathematics, Astronomy and space
- Source: [TED](https://www.ted.com/talks/dennis_wildfogel_how_big_is_infinity)
- Licence: [CC BY-NC-ND 4.0](https://creativecommons.org/licenses/by-nc-nd/4.0/) (Non-commercial use only, and no changed versions.)
- Who can watch: Tweens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

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. \[Lesson by Dennis Wildfogel, directed by Aaron Augenblick, narrated by Dennis Wildfogel\].

## Lectures

1. [How big is infinity?](https://invisiblenetwork.ai/learn/ted/dennis_wildfogel_how_big_is_infinity/230b11aee395), 8 min (TED's player)