What are these symbols? - Numberphile

Asaf Karagila discusses some of the symbols used in Logic and Set Theory. More links & stuff in full description below ↓↓↓ Asaf is a UKRI Future Leaders Fellow. Asaf's blog - https://karagila.org More videos and Numberphile podcast featuring Asaf - https://www.youtube.com/playlist?list=PLt5AfwLFPxWJyt0zdvzvDoeL_8pqO0S7p The video about Aleph and "Absolute Infinity"is here: https://youtu.be/sq-ntG5Mcus * A set theorist's clarification from Asaf commenting on Brady's simplified animations... "By {Primes} we mean the set {2,3,5,7,11,13,...} of prime numbers, rather than the set whose element is the set of prime numbers" Patreon: http://www.patreon.com/numberphile Numberphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://bit.ly/numberphile-janestreet We're also supported by the Simons Laufer Mathematical Sciences Institute (formerly MSRI): http://bit.ly/MSRINumberphile Our thanks also to the Simons Foundation: https://www.simonsfoundation.org NUMBERPHILE Website: http://www.numberphile.com/ Numberphile on Facebook: http://www.facebook.com/numberphile Numberphile tweets: https://twitter.com/numberphile Subscribe: http://bit.ly/Numberphile_Sub Videos by Brady Haran Numberphile T-Shirts and Merch: https://teespring.com/stores/numberphile Brady's videos subreddit: http://www.reddit.com/r/BradyHaran/ Brady's latest videos across all channels: http://www.bradyharanblog.com/ Sign up for (occasional) emails: http://eepurl.com/YdjL9