The story
Named after American mathematician Lester Randolph Ford, Sr., who wrote about them in 1938.
Etymology from Wiktionary, CC BY-SA 4.0.
Ford circle
Today it means: Any one of a class of circles with centre at (p/q, 1/(2q²)) and radius 1/(2q²), where p/q is an irreducible fraction (i.e., p and q are coprime integers). Full definition →