is an equireciprocal point if, for every chord of a curve , satisfies
for some constant . The foci of an ellipse are equichordal points.
is an equireciprocal point if, for every chord of a curve , satisfies
for some constant . The foci of an ellipse are equichordal points.
Weisstein, Eric W. "Equireciprocal Point." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/EquireciprocalPoint.html