Martin Levin, On the Group of Rational Points on Elliptic Curves Over Function Fields, American Journal of Mathematics, Vol. 90, No. 2 (Apr., 1968), pp. 456-462 ...

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 ...