Featuring Professor Maria Chudnovsky from Princeton University - see part two about her work on Perfect Graphs - youtu.be/C4Zr4cOVm9g More links & stuff in full description below ↓↓↓ Professor Chudnovsky's webpage: web.math.princeton.edu/~mchudnov/ Numberphile is supported by the Mathematical Sciences Research Institute (MSRI): bit.ly/MSRINumberphile We are also supported by Science Sandbox, a Simons Foundation initiative dedicated to engaging everyone with the process of science. www.simonsfoundation.org/outreach/science-sandbox/ And support from Math For America - www.mathforamerica.org/ NUMBERPHILE Website: www.numberphile.com/ Numberphile on Facebook: www.facebook.com/numberphile Numberphile tweets: twitter.com/numberphile Subscribe: bit.ly/Numberphile_Sub Videos by Brady Haran Animation and editing by Pete McPartlan Patreon: www.patreon.com/numberphile Numberphile T-Shirts: teespring.com/stores/numberphile Brady's videos subreddit: www.reddit.com/r/BradyHaran/ Brady's latest videos across all channels: www.bradyharanblog.com/ Sign up for (occasional) emails: eepurl.com/YdjL9