Ford circle

Some Ford circles

Meaning

Noun

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).

Origin

Named after American mathematician Lester Randolph Ford, Sr., who wrote about them in 1938.

Modern English dictionary

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