This is the web page of Francis Bonahon

I retired from USC, but not from mathematics

See the "Contact" tab if you want to get in touch with me


Farey-Ford circles



What are those circles? Click here if you want to know more.

 You can even watch more Farey-Ford math in this video on Youtube! I hope that, in addition to the french accent and other idiosyncrasies, you enjoy the math and the fantastic editing work of Brady Haran. The math videos of his  Numberphile channel are really great. This video has now been viewed over 400,000 times (for whatever YouTube defines as a "view").

  • Francis Bonahon