A Breakthrough in Graph Theory - Numberphile

A counterexample to Hedetniemi's conjecture - featuring Erica Klarreich.
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Read Erica Klarreich's Quanta article on this subject: https://www.quantamagazine.org/mathematician-disproves-hedetniemis-graph-theory-conjecture-20190617/

And visit her website: http://www.ericaklarreich.com/

Yaroslav Shitov's breakthrough paper: https://arxiv.org/abs/1905.02167

Thanks to Stephen Hedetniemi for providing us with photos and pages from his original dissertation.

Some more graph theory on Numberphile...
Four Color Maps: https://youtu.be/NgbK43jB4rQ
An Unsolved Problem: https://youtu.be/niaeV_NHh-o
Planar Graphs: https://youtu.be/xBkTIp6ajAg
Perfect Graphs: https://youtu.be/C4Zr4cOVm9g
Friends and Strangers: https://youtu.be/xdiL-ADRTxQ
River Crossings: https://youtu.be/ZCVAGb1ee8A

Numberphile is supported by the Mathematical Sciences Research Institute (MSRI): http://bit.ly/MSRINumberphile

We are also supported by Science Sandbox, a Simons Foundation initiative dedicated to engaging everyone with the process of science. https://www.simonsfoundation.org/outreach/science-sandbox/

And support from Math For America - https://www.mathforamerica.org/

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Видео A Breakthrough in Graph Theory - Numberphile канала Numberphile