Ford circle

短语

词形变化

Ford circles 复数 Ford circles

释义与例句

n.
  1. 1.

    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).

    数学

    Every Ford circle is tangent to the horizontal axis y#61;0, and any two Ford circles are either disjoint or meet at a tangent.

    There is a unique Ford circle associated with every rational number. Additionally, the axis y#61;0 can be considered a Ford circle with infinite radius, corresponding to the case p#61;1,#92;q#61;0.

词源

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

来源：wiktionary