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 ...

In [1] it was shown that two Bessel functions $J_\nu(x), J_\mu(x)$ could have two zeros which were common to both functions, and a computer program was made which ...