Extending a result of Khavinson and $\acute{S}wi\cedil{a}tek$ (2003) we show that the rational harmonic function $\overline {r(z)} - z$, where r(z) is a rational function of degree n > 1, has no more ...

This is a preview. Log in through your library . Abstract Suppose that 2d - 2 tangent lines to the rational normal curve $z \mapsto (1 : z : ... : z^d)$ in d ...