Canad. Math. Bull. 48(2005), 405-408
Printed: Sep 2005
We present a very short proof of Liouville's theorem for solutions
to a non-uniformly elliptic radially symmetric equation. The proof uses
the Ricatti equation satisfied by the Dirichlet to Neumann map.
35B05 - Oscillation, zeros of solutions, mean value theorems, etc.
34A30 - Linear equations and systems, general