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Here is the complete answer.
http://math.stackexchange.com/questions/1376678/runge-kutta-stability/1376710#1376710https://math.stackexchange.com/questions/1376678/runge-kutta-stability/1376710#1376710
Sorry for the duplication.
http://math.stackexchange.com/questions/1376678/runge-kutta-stability/1376710#1376710
https://math.stackexchange.com/questions/1376678/runge-kutta-stability/1376710#1376710
